Concurred to take front off vice (5)
I believe the answer is:
greed
'vice' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for greed that I've seen before include "Craving" , "Rapacious desire" , "Immoderate desire" , "selfish habit" , "Selfish desire" .)