Heretic (11)
I believe the answer is:
revisionist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heretic</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 revisionist that I've seen before include "Deviant communist" , "heretic" , "One wanting to change (a treaty, doctrines, etc)" .)