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