Ordinal number ender (3)
I believe the answer is:
eth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ordinal number ender</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 eth that I've seen before include "Old character" , "Old English letter" , "18's fiance" , "girl" , "Ancient character" .)