A new goal changing the country (6)
I believe the answer is:
angola
'the country' is the definition.
(Angola is an example)
'a new goal changing' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'changing' indicates an anagram.
'goal' anagrammed gives 'gola'.
'a'+'n'+'gola'='ANGOLA'
(Other definitions for angola that I've seen before include "Southwestern African state" , "West African country" , "South-west African country, capital Luanda" , "SW African country" , "SW African republic, capital Luanda" .)