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All answers having "Zip your lip!" as clue:

3 Character Answers:

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SHH



4 Character Answers:

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HUSH



5 Character Answers:

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CANIT

SHUSH



6 Character Answers:

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SHUTUP



8 Character Answers:

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BUTTONIT



11 Character Answers:

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MUMSTHEWORD

PUTALIDONIT



15 Character Answers:

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SILENCEISGOLDEN