Sing a Schumann piece (3)

I believe the answer is:

hum

'sing' is the definition.
(I know that hum is a more specific form of sing)

'a schumann piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'HUM' is hidden in the letters of 'schumann'.

(Other definitions for hum that I've seen before include "Sound of a bee" , "Drone - stink" , "Sing with the mouth shut" , "Reek" , "Low continuous sound" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app