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All answers having "Witticism" as clue:

3 Character Answers:

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MOT

PUN



4 Character Answers:

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JEST

JOKE

QUIP



5 Character Answers:

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CRACK

SQUIB



6 Character Answers:

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BONMOT



7 Character Answers:

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EPIGRAM



8 Character Answers:

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ONELINER



9 Character Answers:

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WISECRACK



10 Character Answers:

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JEUDESPRIT