Diamond Head's location
I believe the answer is:
oahu
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">diamond head's location</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oahu that I've seen before include "Honolulu's island" , "Chief island of Hawaii" , "Hawaiian island" , "Pacific island" , "popular Pacific location" .)