Tough dragon maybe accommodating British, not northern (7)
I believe the answer is:
mobster
'tough' is the definition.
(both can mean a violent person)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for mobster that I've seen before include "Hood" , "family man" , "Member of criminal organisation" , "Mafioso" , "Gangster" .)