Obstinate or stupid (7)
I believe the answer is:
asinine
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">obstinate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">stupid</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for asinine that I've seen before include "Jenny's often like this" , "In the nature of supposedly stupid animal" , "Absurd" , "Silly like a donkey" , "'Mindless, vacuous (7)'" .)