Alias Coral? (5)

I believe the answer is:

carol

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

'coral?' is the wordplay.
'coral' can be anagrammed to 'CAROL'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for carol that I've seen before include "Joyful song - girl's name" , "Song, especially at Christmas" , "Song celebrating the birth of Jesus" , "Girl" , "Joyful religious song" .)

I've seen this clue in the Evening Standard.

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