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All answers having "Mischievous" as clue:

3 Character Answers:

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BAD

SLY



4 Character Answers:

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ARCH

EVIL



5 Character Answers:

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ELFIN

PIXIE



6 Character Answers:

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ELFISH

ELVISH

IMPISH

PRANKY



7 Character Answers:

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NAUGHTY

PLAYFUL

PUCKISH

ROGUISH

TRICKSY



8 Character Answers:

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DEVILISH

RASCALLY



10 Character Answers:

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UPTONOGOOD