Worn out foolish endeavours northern America abandons (8)
I believe the answer is:
overused
'worn out' is the definition.
(worn out can mean overused or overdone)
'foolish endeavours northern america abandons' is the wordplay.
I cannot quite understand how this works, but
'america' could be 'us' (United States) and 'us' is present in the answer.
The remaining letters 'overed' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for overused that I've seen before include "Hackneyed" , "Employed excessively for tasks, probably worn" , "Revues do tend to be excessively utilised" .)