Crossword Genius

You can sing this, but please don't! (7)

Ross

I believe the answer is:

refrain

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This clue could be a double definition.

'you can' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'sing this but please don't' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for refrain that I've seen before include "Hold back" , "Stop oneself (from doing something)" , "Chorus of a song" , "Cease - repeated phrase" , "Kindly desist - from song?" .)

I've seen this clue in the Evening Standard.
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