Casually go around volcano country (7)
I believe the answer is:
vietnam
'country' is the definition.
(I know that Vietnam is a country)
'casually go around volcano' is the wordplay.
'casually go' becomes 'vim' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'around' is an insertion indicator.
'volcano' becomes 'etna' (Mount Etna).
'vim' going around 'etna' is 'VIETNAM'.
Can you help me to learn more?
(Other definitions for vietnam that I've seen before include "Country in SE Asia, capital Hanoi" , "Southeast Asian republic" , "Ho Chi Minh's country" , "Country united in 1976" , "Asian country, capital Hanoi" .)