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All answers having "Shoe parts" as clue:

4 Character Answers:

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TOES



5 Character Answers:

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HEELS

LACES

LASTS

SOLES

VAMPS

WELTS



6 Character Answers:

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CLEATS

UPPERS



7 Character Answers:

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EYELETS

INSOLES

INSTEPS

TOECAPS



8 Character Answers:

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OUTSOLES