Pacific island region (7)
I believe the answer is:
oceania
'pacific island region' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for oceania that I've seen before include "Pacific Ocean area" , "part of the Pacific" , "Polynesia, Micronesia and Melanesia" , "Islands of the central and South Pacific" , "Pacific islands area" .)