Purposeful and unwavering (8)
I believe the answer is:
resolute
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">purposeful and unwavering</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for resolute that I've seen before include "Determined, firm" , "Purposeful and unwavering" , "Determined or decided" , "in a determined manner" , "'With fixed purpose, steadfast (8)'" .)