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All answers having "Closes" as clue:

4 Character Answers:

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ENDS

INKS

ZIPS



5 Character Answers:

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SEALS

SHUTS

STOPS



6 Character Answers:

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ZIPSUP



7 Character Answers:

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ENDINGS

REFOLDS

SHUTSUP

SUTURES



8 Character Answers:

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OCCLUDES