Support in crime (4)
I believe the answer is:
abet
'support in crime' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abet that I've seen before include "Aid and help, perhaps in crime" , "Assist illegally" , "Urge on, help" , "Egg on" , "Criminally endorse" .)