Computer device well known to be quiet (5)

I believe the answer is:

mouse

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'computer device' is the definition.
(a computer mouse)

I don't understand how the remainder of the clue works.

(Other definitions for mouse that I've seen before include "Wimp" , "Timid fellow" , "Small rodent and cursor controller" , "whose movements are captured on screen" , "Squeaky creature" .)

I've seen this clue in the Evening Standard.

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