Mid-month time (4)
I believe the answer is:
ides
'mid-month time' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ides that I've seen before include "One da" , "Julius Caesar was told to beware the . . . . of March" , "Fatal March date or Julius Caesar" , "Caesar was warned to beware the ones of March" , "'''Beware the ... of March'' (Julius Caesar) (4)'" .)