Over-performed (4)
I believe the answer is:
done
I believe this clue is a double definition.
'over' is the first definition.
(thesaurus)
'performed' is the second definition.
(thesaurus)
(Other definitions for done that I've seen before include "agreed" , "Managed" , "Concluded (and dusted?)" , "Completed" , "Robbed" .)