Hydra pegs Clint as psychologically vulnerable and assigns an operative to seduce him. Due to his circus trash past, he's willing to put up with a lot without realizing that something's wrong... and by the time he realizes the danger he's in, it's too late to fight back/she has hostages.

-victim blaming & gender roles being a horrible combo
-being stoic and acting like everything's fine

i will give you an entire garbage dump if kate bishop is one of the metaphorical guns held to his head