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All answers having "High jinks" as clue:

4 Character Answers:

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LARK



5 Character Answers:

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LARKS

REVEL



6 Character Answers:

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ANTICS

CAPERS

PRANKS

STUNTS



9 Character Answers:

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WHOOPDEDO



10 Character Answers:

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TOMFOOLERY



14 Character Answers:

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UPROARIOUSNESS