Songwriter and entertainer first off breaking instrument

• "Everyday I Write the Book" singer
• Major '40s box-office draw
• 9-Across's sidekick
• Rocker Elvis whose aim is true
• Half of a classic comedy duo
• Elvis of music
• "Who's on first?" comic
• Big name in '40s films
• "Buck Privates" co-star

Wikipedia Word definitions in Wikipedia
Costello is an American television sitcom that aired from September 15, 1998 to October 13, 1998.