Somehow engrave one who gets his own back (7)
I believe the answer is:
avenger
'one who gets his own back' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'somehow engrave' is the wordplay.
'somehow' indicates an anagram.
'engrave' is an anagram of 'AVENGER'.
Can you help me to learn more?
(Other definitions for avenger that I've seen before include "Fury results" , "He seeks satisfaction or retribution" , "One getting his own back" , "Someone wanting to get even" , "One exacts retribution" .)