Conflict in street prevalent (6)
I believe the answer is:
strife
'conflict' is the definition.
(I've seen this before)
'street prevalent' is the wordplay.
'street' becomes 'st'.
'prevalent' becomes 'rife' ('rife' can be a synonym of 'prevalent').
'st'+'rife'='STRIFE'
'in' is the link.
(Other definitions for strife that I've seen before include "Warfare" , "Struggle" , "A Cockney's wife is his trouble and .....(60" , "Refits (anag)" , "Conflict, dispute" .)