Answer: whosnext

AnswerCrossword Clue
WHOSNEXTReigning champion's question to challengers
WHOSNEXTTough guy's challenge
WHOSNEXTAlbum featuring the song "Won't Get Fooled Again"
WHOSNEXTService line?
WHOSNEXTAlbum salvaged from the abandoned rock opera "Lifehouse"
WHOSNEXTChampion's challenge
WHOSNEXTQuestion from behind a counter
WHOSNEXT1971 rock album with the hit "Won't Get Fooled Again"
WHOSNEXTWaiting room query