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

Crossword clues for One doing impersonations:

ELVIS: Oft-impersonated one
ROILED: Oft-impersonated one
AUNT: Ray Bolger impersonated one.
APER: One doing impersonations
APER: One who's good at impersonations