Crossword Genius

Music master (7)

Ross

I believe the answer is:

maestro

I'm a little stuck... Click here to teach me more about this clue!

'music master' is the definition.
(I've seen this in another clue)

'master' is the wordplay.
I cannot really see how this works, but
an anagram of 'master' is 'maestr' which is present in the answer.
A single letter 'o' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for maestro that I've seen before include "A master of any art, like music" , "Expert in music etc" , "Outstanding performer" , "Genius possibly" , "Master of an art, or a great conductor of music" .)

I've seen this clue in The Telegraph and The Globe and Mail.
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