The car? I leave it in the open country (5)
I believe the answer is:
motor
'the car?' is the definition.
(motor can informally mean a car)
'i leave it in the open country' is the wordplay.
'leave' suggests deleting specific letters.
'in' indicates putting letters inside.
'the open country' becomes 'moor' (I can't justify this - if you can you should believe this answer much more).
'it' with 'i' removed is 't'.
't' put into 'moor' is 'MOTOR'.
Can you help me to learn more?
(Other definitions for motor that I've seen before include "Drive" , "Engine of vehicle" , "Car; travel quickly" , "Engine - relating to movement" , "Move fast" .)