Determined, unyielding (7)
I believe the answer is:
adamant
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">determined</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">unyielding</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for adamant that I've seen before include "intractable" , "Decided" , "Impervious to pleas or persuasion" , "Unyielding to requests, stubborn" , "Refusing to change one's mind" .)