Ogee shape (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ogee shape</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 ess that I've seen before include "top secret" , "One next to tee" , "Curvaceous letter" , "Letter from Mid-West" , "Alphabet letter" .)