Crossword Genius

Walk out in opposition to arrest (3,2)

Ross

I believe the answer is:

run in

'arrest' is the definition.
(I've seen this before)

'walk out in opposition' is the wordplay.
I cannot really see how this works, but
'in' is within the answer.
The remaining letters 'run' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'to' is the link.

(Other definitions for run in that I've seen before include "Dispute" , "final stages of race" , "Informally, take into custody - on the trot?" , "Disagreement, fight (colloq.)" , "Skirmish" .)

I've seen this clue in The Guardian.
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