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All answers having "Edible tuber" as clue:

3 Character Answers:

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OCA

PAR

PRY

TIE

YAM



4 Character Answers:

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SPUD

TARO



5 Character Answers:

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CUMIN

CURIO



6 Character Answers:

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PICKON

PLENTY

POTATO



7 Character Answers:

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PARLOUR



8 Character Answers:

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SLIPOVER



11 Character Answers:

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SWEETPOTATO