A sighed utterance from an actor? (5)
I believe the answer is:
aside
'utterance from an actor?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'a sighed' is the wordplay.
'sighed' becomes 'side' (I am not sure about this - if you are sure 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" .)