Country starts to get happier adopting new approach (5)
I believe the answer is:
ghana
'country' is the definition.
(Ghana is an example)
'starts to get happier adopting new approach' is the wordplay.
'starts to' indicates taking the first letters.
The first letters of 'get happier adopting new approach' is 'GHANA'.
(Other definitions for ghana that I've seen before include "West African country, independent since 1957" , "Hang a country in Africa" , "Its capital is Accra" , "Ah, nag one into going to Africa" , "West African country getting independence from the UK in 1957" .)