Meghan Markle's ranking of the French musical (7)
I believe the answer is:
duchess
'meghan markle's ranking' is the definition.
(Meghan Markle is the Duchess of Sussex)
'of the french musical' is the wordplay.
'of the french' becomes 'du'.
'musical' becomes 'chess' (Benny Andersson and Bjrn Ulvaeus musical).
'du'+'chess'='DUCHESS'
(Other definitions for duchess that I've seen before include "Titled lady" , "Noble lady" , "Duke's wife" , "title" , "Wife of a duke" .)