Bill settler (5)
I believe the answer is:
payer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bill settler</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for payer that I've seen before include "Remitter" , "One handing over money" , "One foots the bill" , "Someone to fund" , "Who provides money" .)