For a start, it's musical (8)

I believe the answer is:

overture

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'musical' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for overture that I've seen before include "Introductory music" , "Orchestral music at the beginning of an opera" , "10 {COMPOSITION]" , "Approach - musical introduction" , "Musical prelude to opera or ballet" .)

I've seen this clue in the Evening Standard.

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