Unravel as result of a brawl (4)
I believe the answer is:
fray
This clue is a double definition.
'unravel' is the first definition.
(I've seen this in another clue)
'a brawl' is the second definition.
(I've seen this before)
'as result of' acts as a link.
(Other definitions for fray that I've seen before include "Ravel" , "Conflict; wear at edges" , "Rub off, unravel" , "Become threadbare - fight" , "Wear away from rubbing" .)