Split the bill if creator cut off head of hair (2,5)
I believe the answer is:
go dutch
'split the bill' is the definition.
(I've seen this in another clue)
'creator cut off head of hair' is the wordplay.
'creator' becomes 'god' (the creator can mean God).
'off' indicates an anagram.
'head of' indicates taking the first letters.
The initial letter of 'hair' is 'h'.
'cut' is an anagram of 'utc'.
'god'+'utc'+'h'='GO DUTCH'
'if' is the link.
(Other definitions for go dutch that I've seen before include "Pay your own share of bill in Holland?" , "Pay each for oneself" , "to pay only half" , "come to a fifty-fifty financial arrangement" , "Share expenses - in Holland?" .)