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All answers having "Silence" as clue:

3 Character Answers:

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GAG

MUM

OIL

PST

SHH

SSH

TST

VOW



4 Character Answers:

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HIST

HUSH

MUTE

TASK



5 Character Answers:

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ENEMY

PEACE

QUELL

RADIO

SHUSH

SITON

STILL

WHIST

ZIPIT



6 Character Answers:

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MUFFLE

MUZZLE

SHUTUP



7 Character Answers:

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NONOISE

QUIETEN

SQUELCH



8 Character Answers:

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MUTENESS

WITHDREW



9 Character Answers:

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TACITNESS



10 Character Answers:

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NORESPONSE