He's lawless - a little grasping also (6)
I believe the answer is:
bandit
'he's lawless a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'little grasping also' is the wordplay.
'little' becomes 'bit' (a small bit).
'grasping' means one lot of letters goes inside another (inserted letters are held or grasped).
'also' becomes 'and' (both can mean in addition).
'bit' placed around 'and' is 'BANDIT'.
Can you help me to learn more?
(Other definitions for bandit that I've seen before include "Desperado" , "Member of a gang of robbers" , "Crook" , "Enemy aircraft" , "Violent outlaw" .)