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All answers having "Mischief" as clue:

3 Character Answers:

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HOB



4 Character Answers:

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EVIL

HARM



6 Character Answers:

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ANTICS

PRANKS



7 Character Answers:

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HIJINKS



8 Character Answers:

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NUISANCE



9 Character Answers:

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DEVILMENT



10 Character Answers:

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HANKYPANKY



11 Character Answers:

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NAUGHTINESS

SHENANIGANS