Black music, for example, in order for composer (6)
I believe the answer is:
bartok
'composer' is the definition.
(20th-century Hungarian composer Bela Bartok)
'black music for example in order' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'music for example' becomes 'art' (music is a kind of art).
'in order' becomes 'OK' (both can mean acceptable or appropriate).
'b'+'art'+'ok'='BARTOK'
'for' acts as a link.
(Other definitions for bartok that I've seen before include "Hungarian composer and pianist, d. 1945" , "Hungarian composer of folk music" , "Bela ------ (1881-1945), Hungarian composer" , "Bark to attract great Hungarian composer" , "Bela -, Hung. composer" .)