Old European gold coin (5)
I believe the answer is:
ducat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">old european gold coin</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 ducat that I've seen before include "Money no longer" , "Mad; fruit" , "tender once" , "Former Eur. gold coin" , "Old gold coin in e.g. Venice" .)