Mail off to the country (4)
I believe the answer is:
mali
'the country' is the definition.
(Mali is an example)
'mail off' is the wordplay.
'off' indicates an anagram.
'mail' is an anagram of 'MALI'.
'to' acts as a link.
(Other definitions for mali that I've seen before include "African state's" , "Indian gardener; African republic" , "W. African country" , "African country, former French colony" , "Land" .)