Crossword Genius

If the audience can't hear it, nobody can (5)

Ross

I believe the answer is:

aside

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for aside that I've seen before include "Privately, apart" , "(Pushed) out of the way" , "Separately" , "(Turn) off main path" , "Actor's remark for the audience alone" .)

I've seen this clue in the Evening Standard.
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