Noblewoman from French musical (7)

I believe the answer is:

duchess

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'noblewoman' is the definition.
(duchess is a kind of noblewoman)

'french musical' is the wordplay.
'french' becomes 'du' (I can't explain this - if you can you should believe this answer much more).
'musical' becomes 'chess' (Benny Andersson and Bjrn Ulvaeus musical).
'du'+'chess'='DUCHESS'

'from' is the link.

Can you help me to learn more?

(Other definitions for duchess that I've seen before include "Female aristocrat" , "Duke's wife" , "Titled lady" , "Noblewoman" , "Wife of a duke" .)

I've seen this clue in The Sun.

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