Leave spouse in Bow and split costs (2,5)
I believe the answer is:
go dutch
'bow and split costs' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'leave spouse' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'spouse' becomes 'dutch' (I can't explain this - if you can you should believe this answer much more).
'go'+'dutch'='GO DUTCH'
'in' is the link.
Can you help me to learn more?
(Other definitions for go dutch that I've seen before include "share cost" , "Pay for your own meal - in Holland?" , "Pay each for oneself" , "come to a fifty-fifty financial arrangement" , "Share costs equally" .)