Currency replaced by the euro (4)
I believe the answer is:
mark
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">currency replaced by the euro</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 mark that I've seen before include "follower of Jesus" , "Old money" , "Former German coin" , "Point; former coin" , "Scar; note" .)