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All answers having "Humbug!" as clue:

3 Character Answers:

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BAH

BEE

ROT



4 Character Answers:

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BOSH

CANT

FAKE

FLAM

GUFF

SHAM



5 Character Answers:

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FAKER

FRAUD

PSHAW



8 Character Answers:

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BUNCOMBE

CLAPTRAP

FLIMFLAM

NONSENSE

TOMMYROT