Right conclusion produces split (4)
I believe the answer is:
rend
'split' is the definition.
(thesaurus)
'right conclusion' is the wordplay.
'right' becomes 'r' (common abbreviation).
'conclusion' becomes 'end' (end is a kind of conclusion).
'r'+'end'='REND'
'produces' acts as a link.
(Other definitions for rend that I've seen before include "Tear violently" , "Tear to pieces" , "Cleave" , "Rip" , "Tear, sunder" .)