Bugs making a sound we can hear (6)
I believe the answer is:
annoys
'bugs' is the definition.
(I've seen this before)
'a sound we can hear' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
The remaining letters 'noys' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'making' acts as a link.
Can you help me to learn more?
(Other definitions for annoys that I've seen before include "Causes irritation" , "Irritates, bothers" , "Irritates, vexes" , "'Irritates, irks (6)'" , "Bugs" .)