West Indian song (7)
I believe the answer is:
calypso
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">west indian song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)