Crossword Genius

We hear a sighed utterance (5)

Ross

I believe the answer is:

aside

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

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

Can you help me to learn more?

(Other definitions for aside that I've seen before include "Separately" , "remark, incidentally" , "(Turn) off main path" , "Remark not for hearing" , "private" .)

I've seen this clue in The Globe and Mail.
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