Crossword Genius

Sings to oneself (4)

Ross

I believe the answer is:

hums

'sings to oneself' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Universal.
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