Crossword Genius

One to suppress unwanted report on firing? (8)

Ross

I believe the answer is:

silencer

I'm a little stuck... Click here to teach me more about this clue!

'one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'suppress unwanted report on firing?' is the wordplay.
I cannot quite understand how this works, but
'suppress' could be 'silence' (silencing is a kind of suppressing) and 'silence' is found in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for silencer that I've seen before include "Vital part of motoring" , "Device to muffle sound of gun" , "Reclines with sound-muffling device" , "Vehicle noise reducer" , "Exhaust quietener" .)

I've seen this clue in The Sun.
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