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All answers having "Heel" as clue:

3 Character Answers:

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CAD

CUR

END



4 Character Answers:

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CALX

LOUT



5 Character Answers:

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LOUSE

SPIKE



6 Character Answers:

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ANDTOE

NOWSIT

RASCAL

ROTTER



8 Character Answers:

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SOLEMATE



9 Character Answers:

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SCOUNDREL



12 Character Answers:

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DOUBLEDEALER