Musical letter to Disney (5)

I believe the answer is:

waltz

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'musical' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'letter to disney' is the wordplay.
'letter' becomes 'z' (**).
'to' says to put letters next to each other (I've seen this in other clues).
'disney' becomes 'walt' (Walt Disney).
'z' put after 'walt' is 'WALTZ'.

Can you help me to learn more?

(Other definitions for waltz that I've seen before include "Dance in three-four time" , "Ballroom dance in triple time" , "Last dance?" , "Ballroom dance, originally from Germany" , "Valse" .)

I've seen this clue in the Evening Standard.

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