What I remember is, that
a) Clint kills a bad guy in town and uses that corpse as a way to fake his own death.
b) Coulson and/or Natasha finding out and believing Clint dead and grieving. There is a line about how someone forced Hawkeye on his knees to kill him.
c) Clint secretly watches, but doesn't reveal himself.
I hope someone can help me find this again.