Related Clues:

• Carmen or Aida
• Highway rumbler
• Wagner composition
• 'Aida' is one
• 'Fidelio' or 'Faust'
• "La Boheme," e.g.
• "La Boheme," for one
• I-80 hauler
• Circle's beginning?
• Conductor's beginning?
• Weigh station waiter
• Rock or soap follower
• Horse ____
• Where the Marx Bros. spent the night
• Huge truck