Drive for a short time in open country (5)
I believe the answer is:
motor
'drive' is the definition.
(synonyms)
'short time in open country' is the wordplay.
'short time' becomes 'mo' (as in 'just a mo').
'in open country' becomes 'tor' (I can't explain this - if you can you should believe this answer much more).
'mo'+'tor'='MOTOR'
'for a' is the link.
Can you help me to learn more?
(Other definitions for motor that I've seen before include "Move quickly" , "Car (informal)" , "Make good progress" , "Drive" , "(Transport using) engine" .)