Al Capone (8)
I believe the answer is:
scarface
'al capone' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for scarface that I've seen before include "Al Capone, or Tony Montana - 'Say hello to my little friend'." , "US gangster" , "So-called gangster" , "Film starring Al Pacino" , "Al Capone's nickname" .)