Ellipsoid (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ellipsoid</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 oval that I've seen before include "Courageous" , "Elliptical figure" , "not quite round" , "6D 5A [TUBE STATION]" , "Ellipse" .)