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All answers having "Nonsense: Slang" as clue:

3 Character Answers:

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ROT



4 Character Answers:

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ABET

BLAH

BUNK

GUFF

TOSH



5 Character Answers:

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HOKUM

HOOEY



7 Character Answers:

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BALONEY

BOLONEY

EYEWASH



9 Character Answers:

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ARTILLERY