Abandon the fight (5)
I believe the answer is:
scrap
I believe this is a double definition.
'abandon' is the first definition.
(I've seen this before)
'the fight' is the second definition.
(a scrap is a minor fight)
(Other definitions for scrap that I've seen before include "Junk; altercation" , "Discard; a bit" , "row" , "Break up - fight" , "Carps (anag.)" .)