Focus of an earthquake (9)
I believe the answer is:
epicentre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">focus of an earthquake</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for epicentre that I've seen before include "Pure heart" , "Locator for an earthquake" , "Geographical location for earthquake" , "Disaster area" , "in the middle" .)