Surmounting (4)

I believe the answer is:
atop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">surmounting</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 atop that I've seen before include "Situated on" , "on the head" , "At the apex" , "Surmounting" , "in dominant position" .)