Dangerous time for Caesar (4)
I believe the answer is:
ides
'dangerous time 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 "Julius Caesar was told to beware the . . . . of March" , "Fateful day for Caesar" , "13th or 15th day of the month in Roman calendar" , "May 15, for example" , "Julius Caesar was killed during the . . . . of March" .)