Crossword Genius

Sing with closed lips (3)

Ross

I believe the answer is:

hum

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sing with closed lips</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 USA Today, The Times, The Irish Times, The Mirror and the Evening Standard.
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