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All answers having "Twaddle" as clue:

3 Character Answers:

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BOO

PAP

RHO

ROT

YAK



4 Character Answers:

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BLAH

BOSH

BUNK

TOSH



5 Character Answers:

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HOOEY

PRATE

TRIPE



6 Character Answers:

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DRIVEL

GABBLE

PIFFLE



7 Character Answers:

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PALAVER



8 Character Answers:

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CLAPTRAP

NONSENSE

SLIPSLOP

TRUMPERY

UTTERROT



10 Character Answers:

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BALDERDASH