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All answers having "Bugbear" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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BANE

BOGY

OGRE



5 Character Answers:

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BOGIE

THORN



6 Character Answers:

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SCARER



7 Character Answers:

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PROBLEM



8 Character Answers:

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BOGEYMAN

PETPEEVE



9 Character Answers:

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BETENOIRE