Give money back to (5)
I believe the answer is:
repay
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">give money back to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for repay that I've seen before include "Refund or reward" , "Do or give in return" , "Return money borrowed" , "Reimburse" , "recompense" .)