Affray (5)
I believe the answer is:
brawl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">affray</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for brawl that I've seen before include "Affray" , "Fracas" , "Unruly fight" , "Public punch-up" , "squabble" .)