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All answers having "Can it!" 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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SHUSH



6 Character Answers:

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ENOUGH

SHUTUP



7 Character Answers:

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BEQUIET



8 Character Answers:

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QUITTHAT



10 Character Answers:

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DILLPICKLE



12 Character Answers:

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SHUTYOURFACE