Fateful date for Caesar (4)
I believe the answer is:
ides
'fateful date for caesar' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ides that I've seen before include "March 15; dies (anag.)" , "Unlucky day for Julius Caesar" , "Day in Roman months" , "Julius Caesar was killed during the . . . . of March" , "Julius Caesar died in these March days" .)