At an end (4)
I believe the answer is:
over
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at an end</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 over that I've seen before include "Passed" , "See 19" , "Excessive" , "Work out of hours" , "Having gone < to America" .)