West Indian music (6)
I believe the answer is:
reggae
'west indian music' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for reggae that I've seen before include "Bob Marley music" , "West Indian music with strong subsidiary beat" , "W. Indian music style" , "Popular music of the West Indies" , "Jamaican musical style" .)