Crossword Genius

A sighed utterance from an actor? (5)

Ross

I believe the answer is:

aside

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'utterance from an actor?' is the 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?

'a sighed' is the wordplay.
'sighed' becomes 'side' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'side'='ASIDE'

Can you help me to learn more?

(Other definitions for aside that I've seen before include "Privately, apart" , "Actor's remark for the audience alone" , "Out of other people's hearing" , "Words spoken apart in an undertone" , "Away from main action" .)

I've seen this clue in the Evening Standard.
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