Mid-March date (4)
I believe the answer is:
ides
'mid-march date' 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 "Orfes" , "ill-fated time" , "day in Rome" , "March day Caesar died" , "Mid-month day in the Roman calendar" .)