Crossword Genius

Eavesdrop on an insect (3)

Ross

I believe the answer is:

bug

I believe this is a double definition.

'eavesdrop' is the first definition.
(bugging is a kind of eavesdroping)

'an insect' is the second definition.
(bug is a kind of insect)

'on' acts as a link.

(Other definitions for bug that I've seen before include "Harmful microorganism" , "stripped down motor" , "Computer program error" , "Hidden microphone" , "Computer glitch" .)

I've seen this clue in The Mirror.
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