Country that's ravaged vital area (6)
I believe the answer is:
latvia
'country' is the definition.
(Latvia is a European country)
'ravaged vital area' is the wordplay.
'ravaged' indicates an anagram.
'area' becomes 'a' (maths abbreviation).
'vital' is an anagram of 'latvi'.
'latvi'+'a'='LATVIA'
'that's' acts as a link.
(Other definitions for latvia that I've seen before include "Baltic country" , "Baltic republic" , "European republic, capital Riga" , "Riga's country" , "Country in northern Europe" .)