Cry when arrested (6)
I believe the answer is:
squeal
'cry' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for squeal that I've seen before include "Inform (as a pig would?)" , "Yell" , "peach?" , "High-pitched cry, inform" , "Complain" .)