Crossword Genius

Device for listening in bed? (3)

Ross

I believe the answer is:

bug

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'device' is the definition.
(bug is a kind of device)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for bug that I've seen before include "Small crawling creature, now in computer programs" , "Disease-germ" , "Tap" , "Harmful microorganism" , "Fault in program" .)

I've seen this clue in the Evening Standard.
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