Part of Balkans, a Slavic state (6)
I believe the answer is:
kansas
'state' is the definition.
(Kansas is an example)
'part of balkans a slavic' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'KANSAS' is hidden in the letters of 'balkans a slavic'.
(Other definitions for kansas that I've seen before include "Where Dorothy and Toto lived with Aunt Em" , "US state, joined 1861" , "State N. of Oklahoma" , "US state, capital Topeka" , "American state, capital Topeka" .)