At the summit (4)
I believe the answer is:
atop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at the summit</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 atop that I've seen before include "Situated on" , "On a high" , "on the head" , "Covering" , "Surmounting" .)