Wear for the fight (4)
I believe the answer is:
fray
I believe this clue is a double definition.
'wear' is the first definition.
(fraying is a kind of wearing)
'the fight' is the second definition.
(fray is a kind of fight)
'for' acts as a link.
(Other definitions for fray that I've seen before include "Become strained" , "Show effects of strain" , "Combat - wear" , "Unravel at the edges" , "Disturbance" .)