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All answers having "Shut up" as clue:

3 Character Answers:

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GAG

MEW



4 Character Answers:

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CLAM

COOP

HUSH

PENT

SEAL



5 Character Answers:

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CAGED

CANIT

IMMEW

MEWED

PENIN

ZIPIT



6 Character Answers:

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ENCAGE

HUSHED

IMMURE

SEALED



7 Character Answers:

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BEQUIET

CLAMMED

ENCLOSE

KEPTMUM

SILENCE



8 Character Answers:

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CANNEDIT

CLOISTER

CLOSETED

SILENCED



11 Character Answers:

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GIVEITAREST

INCARCERATE



12 Character Answers:

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PUTASOCKINIT



13 Character Answers:

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BUTTONYOURLIP



14 Character Answers:

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BITEYOURTONGUE

NOTANOTHERWORD



15 Character Answers:

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BUTTONEDONESLIP