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All answers having "Seal" as clue:

3 Character Answers:

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CAP

FUR

ICE

INK

LOC

RHO



4 Character Answers:

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SHUT



5 Character Answers:

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CAULK

CLOSE

CRIMP

EARED

OTARY

SIGIL

STAMP

ZIPUP



6 Character Answers:

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CACHET

CLINCH

GASKET

NAILUP

SIGNET



7 Character Answers:

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CLOSEON

SEALION



8 Character Answers:

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PERSPIRE



10 Character Answers:

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CLOSETIGHT



15 Character Answers:

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CIRCUSPERFORMER