Quarrel — fight (3-2)
I believe the answer is:
run-in
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">quarrel</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that quarrel can be written as run-in)</span><br/ ><br/ >'<span class="explanation-format__original">fight</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for run-in that I've seen before include "Home straight" , "Dispute" , "Approach" , "Disagreement (with authority?)" , "Matches late in season" .)