West Indian song (7)
I believe the answer is:
calypso
'west indian song' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for calypso that I've seen before include "W.Indian ballad dealing with topical events" , "Topical West Indian song - orchid - sea nymph" , "West Indian song with variable rhythm and improvised words" , "WI song" , "W. Indies music" .)