March's bad time is widest, yet narrower (4)

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "March day Caesar died" , "Fateful day for Caesar" , "13th or 15th day of the month in Roman calendar" , "For Romans, a day" , "May 15, for example" .)

I've seen this clue in the Sydney Morning Herald.

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