Answer: costello

AnswerCrossword Clue
COSTELLO9-Across's sidekick
COSTELLOPopular comedian.
COSTELLOPremier of O'Kelly's country.
COSTELLOPrime Minister of Eire.
COSTELLOTelevision attraction in March.
COSTELLOP. M. of Eire.
COSTELLOFormer P. M. of Ireland.
COSTELLOActress Dolores
COSTELLOHalf of a 1940's-50's comedy duo
COSTELLOJohn A. of Eire.
COSTELLOOld comic companies reveal nothing (8)
COSTELLOHe didn't know Who's on first
COSTELLOElvis of music
COSTELLORocker Elvis whose aim is true
COSTELLOHe asked "Who's on first?"
COSTELLOHalf of a classic comedy duo
COSTELLO"How did I get on third base?" comedian
COSTELLOAn Elvis
COSTELLOIrish Prime Minister.
COSTELLOPrime Minister of Ireland.
COSTELLO"I'm a bad boy!" sayer
COSTELLOMajor '40s box-office draw
COSTELLOBig name in '40s films
COSTELLO"Who's on first?" asker
COSTELLOAbbott's partner
COSTELLO"Pardon My Sarong" star
COSTELLO"Buck Privates" star
COSTELLO"Who's on First?" comic
COSTELLO"Who's on first?" inquirer
COSTELLOOne of a classic comedy couple
COSTELLORocker Elvis
COSTELLO"Radio Radio" rocker
COSTELLOThe other Elvis