Time for March madness? (4)

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "Fatal March date or Julius Caesar" , "Julius Caesar's unlucky day in March" , "One da" , "Mid-month date in Roman calendar" , "'''Beware the ... of March'' (Julius Caesar) (4)'" .)

I've seen this clue in The New York Times.

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