Right pair get over split (11)
I believe the answer is:
prerogative
'right' is the definition.
(prerogative is a kind of right)
'pair get over split' is the wordplay.
'split' indicates an anagram.
'pair'+'get'+'over'='pairgetover'
'pairgetover' with letters rearranged gives 'PREROGATIVE'.
(Other definitions for prerogative that I've seen before include "Right, privilege" , "Exclusive right/privilege" .)