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All answers having "Reserves" as clue:

5 Character Answers:

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POOLS

SAVES



6 Character Answers:

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CACHES

SPARES

STORES



7 Character Answers:

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MILITIA

NESTEGG



8 Character Answers:

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LAYSAWAY

NESTEGGS



9 Character Answers:

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PUTSASIDE

SETSASIDE



10 Character Answers:

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SECONDTEAM



12 Character Answers:

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SECONDELEVEN