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All answers having "Wag" as clue:

3 Character Answers:

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NOD

WIT



4 Character Answers:

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CARD



5 Character Answers:

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COMIC

CUTUP

JOKER



7 Character Answers:

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FARCEUR



8 Character Answers:

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COMEDIAN

JOKESTER

QUIPSTER

SLYBOOTS

WISEACRE