Schismatic (8)
I believe the answer is:
divisive
'schismatic' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for divisive that I've seen before include "Tending to create dissension" , "Tending to cause disagreement within a group - in arithmetic way?" , "Tending to cause conflict" , "Causing disagreement" , "Troublesome" .)