Country musician Kooper I rage about (7)
I believe the answer is:
algeria
'country' is the definition.
(Algeria is an example)
'musician kooper i rage about' is the wordplay.
'musician kooper' becomes 'Al' (Al Kooper is an American musician).
'about' indicates an anagram.
'i'+'rage'='irage'
'irage' anagrammed gives 'geria'.
'al'+'geria'='ALGERIA'
(Other definitions for algeria that I've seen before include "country in Africa" , "N. African state" , "North-west African country" , "republic in Africa" , "North African country" .)