Short and rather fat (5)
I believe the answer is:
tubby
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">short and rather fat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tubby that I've seen before include "Plump" , "Roly-poly" , "Generously proportioned" , "Short and rather fat" , "Rather overweight" .)