Thickset (6)

I believe the answer is:
stocky
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thickset</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stocky that I've seen before include "Strongly-built" , "Heavily-built" , "Of short and solid stature" , "Of sturdy build" , "Small and well built" .)