Crossword Genius

The sound of 'pong'? (3)

Ross

I believe the answer is:

hum

I believe this clue is a double definition.

'the sound' is the first definition.
(hum is a kind of sound)

''pong'?' is the second definition.
(I've seen this before)

'of' acts as a link.

(Other definitions for hum that I've seen before include "Low sound of bad smell?" , "Pong" , "Insect sound of doubt" , "Smell badly (slang)" , "Drone - stink" .)

I've seen this clue in the Evening Standard.
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