Dispute arrest (3,2)
I believe the answer is:
run in
This clue is a double definition.
'dispute' is the first definition.
(I know that run-in is a type of dispute)
'arrest' is the second definition.
(I've seen this before)
(Other definitions for run in that I've seen before include "Dust-up, row" , "Pick up" , "Final stage" , "Brush" , "Approach; fight" .)