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Alternative clues for the word costello

• He didn't know Who's on first
• Rocker Elvis
• 9-Across's sidekick
• "Who's on first?" comic
• Major '40s box-office draw
• "Buck Privates" co-star
• Big name in '40s films
• "Who's on first?" asker
• Half of a classic comedy duo
• Songwriter and entertainer first off breaking instrument