Crossword Genius

Charm of baroque tuba: euphony in extremis ! (6)

Ross

I believe the answer is:

beauty

'charm' is the definition.
(thesaurus)

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

(Other definitions for beauty that I've seen before include "See 12" , "Opposite fairy tale characters" , "sometimes put before queen?" , "Supremely pleasing quality" , "- Salon; - spot" .)

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