A church council (5)
I believe the answer is:
synod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a church council</span>' is the definition.<br/ ><span class="explanation-format__explanation">(type of church assembly)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for synod that I've seen before include "Ecclesiastical council" , "Assembly of the clergy" , "Ecumenical council" , "Council of bishops" , "Church council" .)