Carried oxygen for large Asian island (6)
I believe the answer is:
borneo
'asian island' is the definition.
(I've seen this before)
'carried oxygen' is the wordplay.
'carried' becomes 'borne' (past tense of 'bear' in the sense of 'carry').
'oxygen' becomes 'O' (O is the chemical symbol for oxygen).
'borne'+'o'='BORNEO'
'for large' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for borneo that I've seen before include "Oberon (anag) - island" , "Island containing Brunei" , "Island in the western Pacific" , "The world's third-largest island" , "West Pacific island" .)