Crossword Genius

One for suppressing reports on driving? (8)


I believe the answer is:


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

I cannot understand how the rest of the clue works.

(Other definitions for silencer that I've seen before include "I keep report quiet" , "Device to muffle sound of gun" , "that back-seat drivers will ignore" , "Reclines with sound-muffling device" , "Device which quietens a car or gun" .)

I've seen this clue in The Times.
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