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All answers having "Lemon" as clue:

3 Character Answers:

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CAR

DUD

TEA



4 Character Answers:

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DROP

SOLE

ZEST



5 Character Answers:

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DROPS

FRUIT

MEYER

SCENT



6 Character Answers:

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CITRON

CITRUS



7 Character Answers:

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USEDCAR



10 Character Answers:

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CITRUSTREE

PROBLEMCAR