Crossword Genius

Sings wordlessly (4)

Ross

I believe the answer is:

hums

'sings wordlessly' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for hums that I've seen before include "Sings wordlessly" , "Sings with closed lips" .)

I've seen this clue in the USA Today and The Telegraph.
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