Soprano favouring finale of Berlioz and nothing more, using forced notes (9)
I believe the answer is:
sforzando
'using forced notes' is the definition.
(musical term for with sudden emphasis or force)
'soprano favouring finale of berlioz and nothing more' is the wordplay.
'soprano' becomes 's' (musical abbreviation).
'favouring' becomes 'for' (I've seen this in other clues).
'finale of' suggests the final letters.
'nothing more' becomes 'o' (resembles 0).
The last letter of 'berlioz' is 'z'.
's'+'for'+'z'+'and'+'o'='SFORZANDO'
(Other definitions for sforzando that I've seen before include "suddenly emphatic" , "Given sudden emphasis" .)