Oddly learned nation (4)
I believe the answer is:
land
'nation' is the definition.
('land' can be a synonym of 'nation')
'oddly learned' is the wordplay.
'oddly' indicates alternate letters.
The alternate letters of 'learned' are 'LAND'.
(Other definitions for land that I've seen before include "Disembark" , "Bring or come ashore" , "See 22" , "Come down to earth" , "win" .)