Corpulent, plump (6)
I believe the answer is:
rotund
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">corpulent</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that corpulent can be written as rotund)</span><br/ ><br/ >'<span class="explanation-format__original">plump</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for rotund that I've seen before include "Bulging" , "Round and plump" , "Full" , "'Corpulent, round (6)'" , "Portly" .)