Beat up to help lawbreaker (4)
I believe the answer is:
abet
'help lawbreaker' is the definition.
'abet' can be an answer for 'help' (I've seen this before). I am unsure of the 'lawbreaker' bit.
'beat up' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'beat' with letters rearranged gives 'ABET'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for abet that I've seen before include "Incite, help" , "Incite (to commit an offence)" , "Support, aid" , "Beat up by way of help" , "Make good" .)