Help with a crime (4)
I believe the answer is:
abet
'help with a crime' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for abet that I've seen before include "Incite (to commit an offence)" , "Encourage or assist (someone) to commit crime" , "Aid and help, perhaps in crime" , "Assist criminally" , "Assist illegally" .)