Related Clues:

• Chief plotter
• Crime boss
• Impetus
• Mastermind
• Spark plug, so to speak
• Chief instigator
• Boss at the jewelry store?
• Head of a cabal
• Sting target, maybe
• Gangbuster's target
• Phone the boss - he's responsible
• Orchestrator of operas recited songs
• One to call boss?
• Chief troublemaker
• Chief mischief maker