Refused to authorise “The Sound of Music” (6)

I believe the answer is:

banned

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'refused' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for banned that I've seen before include "Barred" , "Outlawed" , "Taboo" , "Legally prohibited" , "Group on radio" .)

I've seen this clue in the Evening Standard.

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