A vice that's accepted (6)
I believe the answer is:
agreed
'accepted' is the definition.
(agreeing is a kind of accepting)
'a vice' is the wordplay.
'vice' becomes 'greed' (I've seen this before).
'a'+'greed'='AGREED'
'that's' is the link.
(Other definitions for agreed that I've seen before include "Tallied - reconciled" , "Okayed" , "Jointly decided" , "admitted" , "It's a deal!" .)