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All answers having "Little rascal" as clue:

3 Character Answers:

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ELF

IMP



4 Character Answers:

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BRAT

TYKE



5 Character Answers:

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SCAMP



6 Character Answers:

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RUGRAT

URCHIN



7 Character Answers:

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ALFALFA

STINKER



13 Character Answers:

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MISCHIEFMAKER