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All answers having "Joker" as clue:

3 Character Answers:

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WAG

WIT



4 Character Answers:

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BOZO

CARD



5 Character Answers:

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CLOWN

COMIC

CUTUP



6 Character Answers:

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KIDDER



7 Character Answers:

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BUFFOON

PUNSTER



8 Character Answers:

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COMEDIAN

WISEACRE



9 Character Answers:

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PRANKSTER