Breach of the peace (6)
I believe the answer is:
affray
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breach of the peace</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 affray that I've seen before include "Breach of the peace by public rioting" , "Disturbance in public place" , "public brawl" , "Brawl, disturbance" , "A fight or riot in public" .)