"Rodeo” composer Aaron (7)
I believe the answer is:
copland
'rodeo composer aaron' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for copland that I've seen before include "Notes expert" , "Creator of notes" , "See 9" , "Aaron -; Rodeo, Billy the Kid composer" , "American composer (Fanfare for the Common Man)" .)