Oberon's enchanted island (6)
I believe the answer is:
borneo
'island' is the definition.
(Borneo is an example)
'oberon's enchanted' is the wordplay.
'enchanted' indicates an anagram.
'oberon' is an anagram of 'BORNEO'.
(Other definitions for borneo that I've seen before include "Largest island of the Malay archipelago" , "Large E. Indies island" , "Island, part of the Malay archipelago" , "Oberon on the large Asian island" , "Island containing Brunei" .)