Fight expected by end of bell (4)
I believe the answer is:
duel
'fight' is the definition.
(duel is a kind of fight)
'expected by end of bell' is the wordplay.
'expected' becomes 'due' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'end of' suggests the final letters.
The last letter of 'bell' is 'l'.
'due'+'l'='DUEL'
(Other definitions for duel that I've seen before include "Affaire d'honneur" , "Gentlemen's disagreement" , "battle" , "Fight between two people over an affair of honour" , "Fight to the death between two people" .)