Crossword Genius

They are not generally to be heard speaking (6)

Ross

I believe the answer is:

asides

'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps you can see a link between them that I don't see?

I can't explain the remainder of the clue.

(Other definitions for asides that I've seen before include "They're not heard by everybody" , "Actors' remarks in an undertone" , "Stage whisper" , "Remarks to an audience" , "Stage whispers" .)

I've seen this clue in The Guardian.
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