Assembly of witches (5)
I believe the answer is:
coven
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">assembly of witches</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 coven that I've seen before include "Witches' set" , "collection of bewitching women" , "Some wise women" , "Women's group" , "Company of witches" .)