Obstinately resistant to change (3-4)
I believe the answer is:
die-hard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">obstinately resistant to change</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 die-hard that I've seen before include "Backer of a losing cause" , "Obstinate or dauntless person" , "Person who resists change" , "Ultra-conservative" , "Reactionary (supporter)" .)