Listening device (3)

I think it could be either:

Which length description are you looking for?:

bug

'listening device' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for bug that I've seen before include "Hidden microphone" , "Secret listening device" , "Software fault" , "Annoy; insect" , "Listening device, insect or electronic fault" .)

I've seen this clue in The Mirror and the King Feature Syndicate.

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