Approach; quarrel (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">approach</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">quarrel</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that quarrel can be written as run-in)</span><br/ ><br/ ></span>
(Other definitions for run in that I've seen before include "Approach; fight" , "Brush" , "drive new car" , "Carefully bring to full working order - arrest" , "Dispute" .)