Tubby (5)
I believe the answer is:
plump
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tubby</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for plump that I've seen before include "Rotund" , "Chubby, fat" , "Full of figure" , "Rather fat" , "Fat - set down unceremoniously" .)