Suppositions of male splitting Conservatives (8)
I believe the answer is:
theories
'suppositions' is the definition.
(I've seen this before)
'male splitting conservatives' is the wordplay.
'male' becomes 'he'.
'splitting' is an insertion indicator.
'conservatives' becomes 'tories' (Tory is an example).
'he' going within 'tories' is 'THEORIES'.
'of' acts as a link.
(Other definitions for theories that I've seen before include "Conjectures" , "Set of principles on which practices are based" , "Ideas or suppositions" , "General principles or possibilities" , "Assumptions" .)