Fight over a point of honour (4)
I believe the answer is:
duel
'fight over a point of honour' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for duel that I've seen before include "shoot-out?" , "Combat between two people in matter of honour" , "Prearranged fight with deadly weapons between two people" , "Personal combat" , "One got satisfaction from this" .)