Tough gran gets bashed (8)
I believe the answer is:
gangster
'tough' is the definition.
(thesaurus)
'gran gets bashed' is the wordplay.
'bashed' indicates an anagram.
'gran'+'gets'='grangets'
'grangets' with letters rearranged gives 'GANGSTER'.
(Other definitions for gangster that I've seen before include "Wise guy" , "Member of a mob like Al Capone" , "Mafia man" , "Member of criminal group" , "One of a group of violent criminals" .)