U2's second studio album, released in 1981 (7)
I believe the answer is:
october
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for october that I've seen before include "Pre-Caesarean calendar's eighth month" , "Autumn month" , "Cot robe for this month" , "Bore cot out at this time" , "some weeks" .)