Crossword Genius

Sing with lips closed (3)

Ross

I believe the answer is:

hum

'sing with lips closed' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for hum that I've seen before include "Unpleasant smell" , "Sound of a bee" , "Make musical sound with closed lips" , "Stench" , "Low sound of bad smell?" .)

I've seen this clue in the Newsday and the Newsday.com.
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