Leave wife the means to settle the bill (2,5)
I believe the answer is:
go dutch
'means to settle the bill' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'leave wife' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'wife' becomes 'dutch' (slang term).
'go'+'dutch'='GO DUTCH'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for go dutch that I've seen before include "Split the bill" , "Pay for your own meal - in Holland?" , "Pay separately" , "share cost" , "split the cost" .)