Indonesian island has imported starter of Thai curry (5)
I believe the answer is:
balti
'curry' is the definition.
'indonesian island has imported starter of thai' is the wordplay.
'indonesian island' becomes 'bali' (island of Indonesia).
'has imported' means one lot of letters goes inside another.
'starter of' says to take the initial letters.
The first letter of 'thai' is 't'.
'bali' going around 't' is 'BALTI'.
(Other definitions for balti that I've seen before include "Type of curry" , "Pakistani curry dish, originating perhaps in 1970s' Birmingham" , "Style of curry" , "Curry dish cooked and served in a flat-bottomed pot" , "Spicy Indian dish served in a metal pot" .)