Mark of a law-breaker out East (4)
I believe the answer is:
weal
'mark' is the definition.
(I've seen this before)
'law-breaker out east' is the wordplay.
I cannot quite understand how this works, but
'east' could be 'e' (abbreviation) and 'e' is present in the answer.
an anagram of 'law' is 'wal' which is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'of a' acts as a link.
Can you help me to learn more?
(Other definitions for weal that I've seen before include "Raised scar" , "Mark of wound - welfare" , "Welt" , "Sign of injury" , "Mark, scar of blow on skin" .)