A fight broken off? (5)
I believe the answer is:
scrap
'a fight' is the definition.
(a scrap is a minor fight)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for scrap that I've seen before include "Argy-bargy" , "Small piece; abolish" , "Waste metal or informal fight" , "Break up - fight" , "Tiny piece; abolish" .)