Pig-headed (9)
I believe the answer is:
obstinate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pig-headed</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 obstinate that I've seen before include "Blindly stubborn" , "headstrong" , "Pig-headed" , "Stubborn, obdurate" , "Mulish" .)