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All answers having "Spare ___" as clue:

3 Character Answers:

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RIB



4 Character Answers:

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KEYS

LANK

LEAN

SAVE

SLIM

THIN

TIRE



5 Character Answers:

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EXTRA

LANKY

TIRES



6 Character Answers:

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MEAGER

SKINNY

THEROD

UNUSED



7 Character Answers:

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AUSTERE

LETLIVE



8 Character Answers:

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EXTRAONE

GOEASYON