Symphonic poem inventor (5)
I believe the answer is:
liszt
'symphonic poem inventor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for liszt that I've seen before include "music writer" , "Franz . . . . ., 19th century Hungarian composer and pianist" , "Brahms and - is rhyming slang for drunk" , "Famous composer" , "Franz -, Hung. pianist" .)