Possible Clues:

• Pitching device?
• Mob head
• Leader of gang better off at first
• Round detonator first used by head of a branch of the Mafia
• Go one better and ring Mafia leader
• Gangster boss promoted old man in 'the Firm'
• Bung given to old, so-called Mafia boss
• Halo given to cover head
• Head of a crime syndicate
• Mafia muck-a-muck