One interrupts a law-breaker to complain (4)

I believe the answer is:

wail

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'complain' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for wail that I've seen before include "Sorrowful cry" , "Long cry, sounds like cetacean" , "Cry of grief" , "Cry, moan" , "(Make a) plaintive cry" .)

I've seen this clue in the Evening Standard.

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