Without payment (6)
I believe the answer is:
gratis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without payment</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 gratis that I've seen before include "Free (Latin)" , "Free of charge" , "not charged" , "Free, costs nothing" , "Free, at no cost" .)