Day in Roman month (4)
I believe the answer is:
ides
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">day in roman month</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ides that I've seen before include "Mid-month day in the Roman calendar" , "day in Rome" , "Caesar's bad day in March" , "Caesar's fateful day" , "For example, March 15 in the Roman calendar" .)