Top of the world (5,4)
I believe the answer is:
north pole
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">top of the world</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 north pole that I've seen before include "Extreme Arctic position" , "Where the only way is down" , "One end of earth's axis" , "Arctic goal" , "Hotel porn (anag)" .)