Mail a payment (5)
I believe the answer is:
remit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mail a payment</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 remit that I've seen before include "Pay for timer" , "Send - terms of reference" , "Send (money) by post" , "Desist from" , "Send back; scope of authority" .)