Main island of French Polynesia (6)
I believe the answer is:
tahiti
'main island of french polynesia' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tahiti that I've seen before include "South Pacific island where both Robert Louis Stevenson and Paul Gauguin spent time" , "Pacific island, Gauguin's home in the 1890s" , "I hit at the tropical island" , "Island in South Pacific, chief town Papeete" , "Windward island" .)