One helps to hush up a report (8)

I believe the answer is:

silencer

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'one helps to' is the definition.
I can't tell whether this defines the answer.

'hush up a report' is the wordplay.
'hush up' becomes 'silence' ('silence' can be a synonym of 'hush up').
'a report' becomes 'r' (this might be a standard abbreviation of which I'm unaware).
'silence'+'r'='SILENCER'

Can you help me to learn more?

(Other definitions for silencer that I've seen before include "Reclines with muffling device" , "Gun accessory" , "Device which quietens a car or gun" , "it offers some peace" , "Fitment for exhaust or gun barrel" .)

I've seen this clue in The Telegraph.

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