Odd's opposite (4)
I believe the answer is:
even
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">odd's opposite</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 even that I've seen before include "Crisp and ---, how King Wenceslas found the snow" , "Smooth, uniform in quality" , "Pantomime" , "Stable" , "Going so far as to" .)