Related Clues:

• Carmen or Aida
• Pigs digs
• Wagner composition
• 'Aida' is one
• Ink-filled tool
• Signing-ceremony souvenir
• 'Fidelio' or 'Faust'
• "La Boheme," e.g.
• "La Boheme," for one
• Sword's mightier rival
• See 44 Across
• Bic product
• Rock or soap follower
• Horse ____
• Where the Marx Bros. spent the night