Because of this, comparatively little is heard (8)

I believe the answer is:

silencer

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'because of this comparatively little is heard' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for silencer that I've seen before include "Device to muffle sound of gun" , "Quieter" , "Fitment for exhaust or gun barrel" , "Gun accessory" , "I keep report quiet" .)

I've seen this clue in the Evening Standard.

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