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

Crossword clues for Dorothy Sayers' sleuth. 15 letters:

LORDPETERWIMSEY: Dorothy Sayers' sleuth.
LORDPETERWIMSEY: Dorothy L. Sayers's bon vivant sleuth
PETERWIMSEY: Dorothy Sayers sleuth introduced in 1923