Witches' group (5)
I believe the answer is:
coven
'witches' group' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for coven that I've seen before include "collection of bewitching women" , "Witch group" , "Group of witches" , "Company of witches" , "Witches' assembly" .)