Black Sea peninsula (6)
I believe the answer is:
crimea
'black sea peninsula' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for crimea that I've seen before include "Ukrainian peninsula, scene of war" , "Peninsula in Ukraine where the Light Brigade charged" , "'Ukrainian peninsula, site of a 19th-century war (6)'" , "former war site" , "Ukraine peninsula, scene of war (1853-6)" .)