Mailing charge (7)
I believe the answer is:
postage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mailing charge</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 postage that I've seen before include "Charge for 23 Acrosses" , "Mailing cost" , "Cost to send a mail item" , "Cost of corresponding" , "Money charged for delivery" .)