Split in church unity (6)
I believe the answer is:
schism
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">split in church unity</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 schism that I've seen before include "Splitting of a Church" , "(Ecclesiastical) division" , "Dividing of group into opposing factions" , "Formal division of a church into two" , "Split or heresy" .)