In the Roman calendar, the ninth day before the ides of each month (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
nones
(Other definitions for nones that I've seen before include "Hour of prayer" , "In the Roman calendar, the ninth day before the ides" , "Old Roman date" , "Time to pray" , "Roman monthly date" .)