Divided island of Southeast Asia (5)
I believe the answer is:
timor
'divided island of southeast asia' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for timor that I've seen before include "Indonesian territory" , "Island north of Australia" , "Island of the Malay Archipelago" , "SE Asian island" , "Eastern island" .)