Gangster, thug (7)
I believe the answer is:
hoodlum
This clue is a double definition.
'gangster' is the first definition.
(I've seen this before)
'thug' is the second definition.
(synonyms)
(Other definitions for hoodlum that I've seen before include "Petty ruffian" , "Rowdy" , "Young thug or criminal" , "tough!" , "Hooligan" .)