Unguis (4)
I believe the answer is:
nail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unguis</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nail that I've seen before include "Part of finger" , "Collar -- cop" , "Finger feature (and tooth?)" , "stud" , "Apprehend" .)