Possible Clues:

• Mob honcho
• One reporting to an underboss
• Better ring family man
• Guitarist’s accessory
• Clamp on a stringed instrument
• Clamp that transposes a guitar's pitch
• Criminal head of international ring
• Mafia boss regularly knocking out champion
• Device used by guitarists which has the same effect as a movable bridge
• Guitarist's key changer