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All answers having "In reserve" as clue:

4 Character Answers:

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HELD



5 Character Answers:

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APART

ASIDE

ONICE

ONTAP

SAVED

SPARE



6 Character Answers:

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STORED



7 Character Answers:

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TOSPARE



8 Character Answers:

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STOREDUP



12 Character Answers:

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UPONESSLEEVE