Contest of honour (4)
I believe the answer is:
duel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contest of honour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for duel that I've seen before include "Contest to settle point of honour" , "One got satisfaction from this" , "Arranged fight" , "Fight between two persons" , "Fight over a point of honour" .)