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All answers having "Popular comedian" as clue:

3 Character Answers:

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COS



4 Character Answers:

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HOPE

KAYE

LAHR

SAHL

WYNN



5 Character Answers:

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BURNS



6 Character Answers:

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CANTOR



7 Character Answers:

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BOBHOPE



8 Character Answers:

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COSTELLO



11 Character Answers:

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MRONEMOSTEL



12 Character Answers:

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JIMMYDURANTE