Style of music regularly encountered in Croatia (3)
I believe the answer is:
rai
'style of music' is the definition.
(I know that Rai is a style of music)
'regularly encountered in croatia' is the wordplay.
'regularly encountered in' indicates alternate letters (letters taken at regular intervals).
The alternate letters of 'croatia' are 'RAI'.
(Other definitions for rai that I've seen before include "Arab-Algerian music style" , "Algerian pop" , "African pop music" , "Music style influenced by North Africa" , "Algerian music" .)