Share costs (2,5)
I believe the answer is:
go dutch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">share costs</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for go dutch that I've seen before include "Pay your own share of bill in Holland?" , "to pay only half" , "Share costs equally" , "Share expenses - in Holland?" , "Pay for one's own entertainment - in Holland?" .)