Retire unexpectedly to a country (7)
I believe the answer is:
eritrea
'country' is the definition.
(I know that Eritrea is a country)
'retire unexpectedly to a' is the wordplay.
'unexpectedly' indicates an anagram.
'retire' anagrammed gives 'eritre'.
'eritre'+'a'='ERITREA'
(Other definitions for eritrea that I've seen before include "part of Africa" , "State of northeast Africa" , "Country bordering the Red Sea" , "Asmara area" , "It achieved independence from Ethiopia in 1993" .)