South polar region (9)
I believe the answer is:
antarctic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south polar region</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for antarctic that I've seen before include "Relating to southern polar region" , "Continent?" , "Of far southern regions" , "Penguin's home" , "Relating to S. Pole region" .)