Remiss not having vehicle round east (8)
I believe the answer is:
careless
'remiss' is the definition.
(I know that remiss can be written as careless)
'not having vehicle round east' is the wordplay.
I cannot really see how this works, but
'not' could be 'less' (I've seen this in other clues) and 'less' is present in the answer.
'vehicle' could be 'car' (car is a kind of vehicle) and 'car' is found in the answer.
'east' could be 'e' (abbreviation) and 'e' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for careless that I've seen before include "Lax" , "Sloppy" , "Inattentive to one's work" , "Inconsiderate" , "Marked by lack of attention" .)