Conflict on street - widespread (6)
I believe the answer is:
strife
'conflict' is the definition.
(I know that strife is a type of conflict)
'on street widespread' is the wordplay.
'on' means one lot of letters go next to another.
'street' becomes 'st' (abbreviation).
'widespread' becomes 'rife' (rife can mean widespread or universal).
'st'+'rife' is 'STRIFE'.
(Other definitions for strife that I've seen before include "Refits (anag)" , "Contention or contest" , "A Cockney's wife is his trouble and .....(60" , "Warfare" , "Trouble, hassle" .)