Pay individually — split other half? (2,5)
I believe the answer is:
go dutch
'pay individually' is the definition.
(to go Dutch is to split a bill)
'split other half?' is the wordplay.
'split' becomes 'go' (split can mean to run away or leave).
'other half?' becomes 'dutch' (both are informal terms for one's wife).
'go'+'dutch'='GO DUTCH'
(Other definitions for go dutch that I've seen before include "Share expenses equally" , "Pay for your own meal - in Holland?" , "Pay each for oneself" , "Pay for one's own entertainment - in Holland?" , "share cost" .)