Expected money for a fight (4)
I believe the answer is:
duel
'for a fight' is the definition.
(duel is a kind of fight)
'expected money' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'money' becomes 'l' (L can mean 'pounds').
'due'+'l'='DUEL'
(Other definitions for duel that I've seen before include "Affair of honour (between two men)" , "Prearranged fight with deadly weapons between two people" , "Fight over a point of honour" , "Gentlemen's disagreement" , "Personal combat" .)