The largest island in French Polynesia (6)
I believe the answer is:
tahiti
'the largest island in 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 "Society member" , "An isle in the South Seas" , "Windward island" , "Pacific island associated with Gauguin" , "Pacific island, the largest in French Polynesia" .)