Unconcerned being unable to drive round rear of village (8)
I believe the answer is:
careless
'unconcerned' is the definition.
(associated in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for careless that I've seen before include "impetuous" , "Sloppy" , "Inattentive and negligent" , "Lax" , "'Thoughtless, inattentive (8)'" .)