European country with a musical sound (6)
I believe the answer is:
greece
'european country' is the definition.
(country in Europe)
'musical sound' is the wordplay.
'musical' becomes 'grease' (Grease is a film musical).
'sound' shows a homophone (sound like).
'grease' sounds like 'GREECE'.
'with a' acts as a link.
(Other definitions for greece that I've seen before include "Country of southeast Europe" , "in E" , "Athens its capital" , ""The cradle of civilisation"" , "The country sounds slippery" .)