It populates fantastic Thai island (6)
I believe the answer is:
tahiti
This clue might be a double definition.
'it populates fantastic thai' is the first definition.
The definition suggests a singular noun which matches the answer.
'island' is the second definition.
(I know that Tahiti is a island)
Can you help me to learn more?
(Other definitions for tahiti that I've seen before include "Island in South Pacific, chief town Papeete" , "Polynesian island, chief town Papeete" , "Romantic Polynesian island, capital Papeete" , "South Pacific island where both Robert Louis Stevenson and Paul Gauguin spent time" , "French Polynesian island" .)