Brian good enough for a musical (9)

I believe the answer is:

brigadoon

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'for a musical' is the definition.

'brian good enough' is the wordplay.
'brian good' can be anagrammed to 'BRIGADOON'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for brigadoon that I've seen before include "Lerner and Loewe musical" , "Musical entertainment" , "Musical set in Ireland" , "Musical set in Scotland" .)

I've seen this clue in the Sydney Morning Herald.

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