Voucher for money owed (4)
I believe the answer is:
chit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">voucher for money owed</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 chit that I've seen before include "Short official note recording a sum owed" , "Pert young lady" , "struck" , "Docket; pert girl" , "Impudent youngster" .)