A Schumann piece you can sing (3)

I believe the answer is:

hum

I'm a little stuck... Click here to teach me more about this clue!

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

'a schumann piece you' is the wordplay.
'HUM' is hidden within the letters.
But, I'm unsure how the hidden word is indicated.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for hum that I've seen before include "Make musical sound with closed lips" , "Pong" , "Be in great activity" , "Low continuous sound" , "Sing like a bee?" .)

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