Conforming to established doctrine (8)
I believe the answer is:
orthodox
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">conforming to established doctrine</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 orthodox that I've seen before include "Traditional" , "not Independent-minded?" , "Standard" , "Accepted, conventional" , "Regular - conventional" .)