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All answers having "Rot" as clue:

3 Character Answers:

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BAH

SPA



4 Character Answers:

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BUNK

TOSH



5 Character Answers:

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ADDLE

DECAY

GOBAD

GOOFF

HOOEY

SPOIL

TRIPE



6 Character Answers:

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DRIVEL

FESTER

PERISH

PIFFLE



7 Character Answers:

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BALONEY

DISEASE

PUTREFY

TWADDLE



9 Character Answers:

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DECOMPOSE

GOTOWASTE

POPPYCOCK



10 Character Answers:

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BALDERDASH



12 Character Answers:

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GERMANFORRED

UTTERRUBBISH