Lunatic earl in ultimately wild country (7)
I believe the answer is:
ireland
'country' is the definition.
(Ireland is an example)
'lunatic earl in ultimately wild' is the wordplay.
'lunatic' indicates anagramming the letters.
'ultimately' says to take the final letters.
The last letter of 'wild' is 'd'.
'earl'+'in'='earlin'
'earlin' is an anagram of 'irelan'.
'irelan'+'d'='IRELAND'
(Other definitions for ireland that I've seen before include "Nation, the Oireachtas its parliament" , "See 10" , "music's John" , "European country" , "Hibernia" .)