Elliptical (4)
I believe the answer is:
oval
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">elliptical</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oval that I've seen before include "Egg shape, roughly" , "Where a duck may be broken" , "Elliptical figure" , "6D 5A [TUBE STATION]" , "Elliptical - cricket ground" .)