Related Clues:

• One heading up illicit activity
• One heading an illicit activity
• With injection of metallic element double the brains
• Subject of Wagner songs perhaps quoted in Mastermind
• Band's number one songs heard after operatic work
• Lecturer with endless fire within is chief troublemaker
• Band's director heard songs after operatic works
• First member in the circle?
• Instigator troubled grenadier travelling round lake
• Glen raider going out as head of the gang
• Instigator of illegal deals at auction
• ...blame me for extra clause adopting unusual angle
• Mischief-maker in band with outspoken songs
• Chief instigator?
• Criminal mastermind