Split the bill (2,5)
I believe the answer is:
go dutch
'split the bill' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for go dutch that I've seen before include "Pay for your own meal - in Holland?" , "Pay for your own entertainment - in Amsterdam?" , "Split the bill" , "to pay only half" , "split the cost" .)