Keen Eyesight
Quite possibly the foundation for the skills he developed later Clint was born with extremely keen vision, while not superhuman by any means he does possess 20/15 vision.
Agility
Due to his life as a circus performer, secret agent and superhero Clint's body has been honed to a degree that puts him amongst he best that humanity has to offer. He moves very well and has natural instincts that allow him to avoid dangers that would fell many others.
A.S.L
Having been deafened at a young age with no idea of its permanancy, Clint was taught ASL in order to communicate. He's a little rusty on it, thankfully for not having to use it lately, but he's still got more than the basics down. He can order a beer or order an attack with equal ease. Don't ask him to stand up in the front of the room and sign for a speech though
Archery
There is just something magical that happens when Clint has a bow in his hand. Sometimes, however, his target isn't the most obvious of things, and the results aren't always immediate, thus leading some to believe that he'd missed his mark. He is one of the best if not the best archer in his world; not only has he trained intensively since his youth, he has also honed his abilities in combat with all manner of enemies. Very few can match his ability with a bow. As well as his archery, Clint does have the ability to work on his own arrows, whether they are the cedar/pile type or the higher tech. He will leave the high-tech points to the R&D department, however.
Can't Miss
No matter what he's got, Clint's hand/eye coordination is near perfect. Whatever he is aiming at, he can hit, whether it is bow/arrow, ball, dart, golf…
Pilot
Clint's been taught how to fly SHIELD's aircraft, from large airplanes to Quinjets to helicopters.
Tactics
Although he does not usually take the time to think through things he has learned how to fight as much with his head as his body. He is skilled at assessing opponents quickly and coming up with the best way of dealing with them, though admittedly sometimes for him that is avoidance or delay until help arrives.
Acrobatics
Another one of those circus skills he picked up that has served him well later in life, while he was never a professional acrobat in him time there he did train with them and has used those skills to great affect since leaving the circus.
Thrown Weapons
While known primarily as an archer, Clint was trained as a knife thrower first and while he does not use that skill as much as his archery he still maintain some skill in it. While he does not carry any weapons with him for this purpose he has practiced with many standard office and household items meaning he almost always has a weapon at hand.
Bow
Made by SHIELD with the finest of available materials this bow is both lightweight and sturdy, it is also designed to collapse into about one fourth it's size when in use to then be easily stored in his quiver.
Specialty Arrows
In addition to the normal arrows he does carry shafts without points that modular heads can be fitted too. These heads have varied uses, the ones that are most commonly seen, are Nets that deploy to entangle his foes, electrically charged head that stun opponents with out damaging them, specially designed heads that release knock out gas on impact, and a head that is deploys a grappling hook and rope to enable Clint ot climb up surfaces, or slide down the rope as the case my be, and finally explosive heads that go off on impact, he uses these only against threats that he knows to be well beyond human ability to absorb damage or vehicles.
SHIELD
Clint has access to almost everything SHIELD has. He has access to their aircraft, their helicarriers, labs, medical facilities, databases. And he gets paid. It also gives him access to a small hand device that allows communication between Clint and other SHIELD operatives as well as installations. It can also be used to monitor communications on other radio frequencies, even those that may be secured.
Level Clearance
With SHIELD comes his security clearance. He can find out things that others may not have access to. For something to be redacted for him, that is rare. There are only one, two people who have a higher security clearance than he.
Partner
Clint has a partner who has his 6, and he has theirs. Clint may say that he's a 'loner', but there is no one who knows his partner better than he (so he believes), and vice versa (which is probably true)..
High School Dropout
Clint left school after his parents died. As a result, he's not much for the paperwork and studying thing, hunting and pecking on keyboards. He's more a 'doing' kind of guy. He does have a pretty good grasp of common sense, however.
Target
Unfortunately with SHIELD comes their enemies. Clint is a walking target-face due to his actions and operations within his agency.
Neighborhood Bullies
Clint has made some enemies in his neighborhood as he's basically trying to keep his block safe and crime free. The local Russian mob isn't really happy about it and will, on occasion, attempt to convince him to change his ways.
Human In A Super World
Normally this wouldn't be a disadvantage, but in the arena in which Clint plays, he's almost always up against powers greater than himself, whether it's powersuits, higher technology, or out and out mutants or monsters. He's only human and is injurable, if not killable.