Opera composer (7)
I believe the answer is:
rossini
'opera composer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rossini that I've seen before include "Staff writer" , "Composer born 29 Feb 1792" , "Largo al factotum composer" , "Composer of the opera William Tell, d. 1868" , "He composed operas" .)