Turn a blind eye to trick that's performed (7)
I believe the answer is:
condone
'turn a blind eye' is the definition.
(I've seen this before)
'trick that's performed' is the wordplay.
'trick' becomes 'con' (a con is a fraud or trick).
'that's performed' becomes 'done' (done can mean performed or accomplished).
'con'+'done'='CONDONE'
'to' is the link.
(Other definitions for condone that I've seen before include "Excuse made" , "Accept (wrong behaviour)" , "Nod once (anag) -- make allowances for" , "'Excuse, overlook (7)'" , "pardon" .)