Crossword Genius

Sing with closed lips (3)

Ross

I believe the answer is:

hum

'sing with closed lips' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for hum that I've seen before include "Sound of busy activity" , "Stench" , "Murmur" , "Sound (of business?)" , "Whirring" .)

I've seen this clue in The Mirror, the USA Today, The Irish Times and The Times.
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