Show contempt for party that's split (7)
I believe the answer is:
dissect
'split' is the definition.
(thesaurus)
'show contempt for party' is the wordplay.
'show contempt for' becomes 'dis'.
'party' becomes 'sect' (I've seen this in another clue).
'dis'+'sect'='DISSECT'
'that's' acts as a link.
(Other definitions for dissect that I've seen before include "Anatomize" , "Examine minutely" , "Critically examine" , "Anatomise" , "Cut up (for study)" .)