Unorthodox opinion (6)
I believe the answer is:
heresy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unorthodox opinion</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for heresy that I've seen before include "Unorthodoxy - apostasy" , "Religious non-conformity" , "Yes her (anag.)" , "Unorthodox religious belief" , "Opinion opposed to conventional belief" .)