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All answers having "Mischievous sprite" as clue:

3 Character Answers:

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ELF

IMP



5 Character Answers:

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ELFIN

PEACE

PIXIE

SMACK



6 Character Answers:

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GOBLIN



7 Character Answers:

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GREMLIN



8 Character Answers:

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MATERNAL



9 Character Answers:

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APPENDAGE