South Seas islands (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south seas islands</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oceania that I've seen before include "Polynesia, Micronesia and Melanesia" , "Islands of the south Pacific -- a neo-CIA (anag)" , "part of the Pacific" , "The Pacific islands taken together" , "Pacific island area" .)