"New World Symphony” composer (6)
I believe the answer is:
dvorak
'new world symphony composer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dvorak that I've seen before include "Czech musician" , "Antonin ......, 19th century Czech composer of New World Symphony" , "Antonin ------, Bohemian composer" , "One who composed" , "keyboard" .)