Not evil maybe; just lacking restraint (7)
I believe the answer is:
'lacking restraint' is the definition.
'not evil maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'notevil' anagrammed gives 'VIOLENT'.
'just' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for violent that I've seen before include "not peaceful either" , "Intensely forceful" , "Brutal - intense" , "Immoderate" , "Bloodthirsty" .)