A former president from uncultivated country (4)
I believe the answer is:
bush
I believe this clue is a double definition.
'a former president' is the first definition.
(either of the George Bushes)
'uncultivated country' is the second definition.
'from' acts as a link.
(Other definitions for bush that I've seen before include "Scrub" , "Remote country" , "Shrub; axle lining" , "US president(s) - source of gooseberries" , "A shrub or a modern president" .)