Balkan region amid ocean waves (9)
I believe the answer is:
macedonia
'balkan region' is the definition.
(region of Europe)
'amid ocean waves' is the wordplay.
'waves' is an anagram indicator.
'amid'+'ocean'='amidocean'
'amidocean' anagrammed gives 'MACEDONIA'.
(Other definitions for macedonia that I've seen before include "Landlocked Balkan country" , "European country, capital Skopje" , "Alexander the Great's homeland" , "republic" , "Southeast European country" .)