Eighth month in the Roman calendar (7)
I believe the answer is:
october
'eighth month in the roman calendar' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for october that I've seen before include "Cot robe for this month" , "some weeks" , "Pre-Caesarean calendar's eighth month" , "Bore cot out at this time" , "Autumn month" .)