Fool raced around considerably vexed (8)
I believe the answer is:
harassed
'vexed' is the definition.
(I know that vexed can be written as harassed)
'fool raced around' is the wordplay.
'fool' becomes 'ass' (both can mean a stupid person).
'raced' becomes 'hared' (I've seen this before).
'around' indicates putting letters inside.
'ass' going within 'hared' is 'HARASSED'.
'considerably' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for harassed that I've seen before include "Distraught" , "Annoyed and troubled continually" , "in a state of torment" , "Constantly intimidated" , "Badgered" .)