Forgive scam performed (7)
I believe the answer is:
condone
'forgive' is the definition.
(condoning is a kind of forgiving)
'scam performed' is the wordplay.
'scam' becomes 'con' (both can mean a fraudulent scheme).
'performed' becomes 'done' (done can mean performed or accomplished).
'con'+'done'='CONDONE'
(Other definitions for condone that I've seen before include "Accept or forgive (bad behaviour)" , "'Excuse, overlook (7)'" , "pardon" , "Overlook - forgive" , "Excuse made" .)