Fateful March date (4)
I believe the answer is:
ides
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fateful march date</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 ides that I've seen before include "Unlucky day for Julius Caesar" , "Day in Roman months" , "Fateful day for Caesar" , "March day fatal to Julius Caesar" , "date for 21 [ROMAN]?" .)