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All answers having "Squelch" as clue:

3 Character Answers:

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END

GAG

NIX



5 Character Answers:

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QUASH

SITON



6 Character Answers:

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KIBOSH

STEPON

STIFLE



7 Character Answers:

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SILENCE

SMOTHER



8 Character Answers:

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SUPPRESS



14 Character Answers:

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PUTTHEKIBOSHON