Paying passenger (4)
I believe the answer is:
fare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">paying passenger</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fare that I've seen before include "Taxi passenger; food" , "Food, or price of bus ticket" , "Cost of travel" , "Food for the table" , "Amount charged" .)