Old French currency
I believe the answer is:
franc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">old french currency</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for franc that I've seen before include "Former French monetary unit" , "Former French coin" , "Historic currency" , "It's equal to 100 centimes" , "Swiss capital" .)