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Alternative clues for the word costello

• "Who's on first?" comic
• "Who's on first?" asker
• Actress Dolores
• "Everyday I Write the Book" singer
• "How did I get on third base?" comedian
• "Buck Privates" co-star
• Elvis of music
• Rocker Elvis whose aim is true
• 9-Across's sidekick
• "Radio Radio" rocker