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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Host of the 1950s' "Your Show of Shows" 9 letters:

SIDCAESAR: Host of the 1950s' "Your Show of Shows"
DINGDONGSCHOOL: 1950s kiddie show hosted by "Miss Frances"
MARX: 1950s-'60s TV quiz show host