Black Sea peninsula (6)
I believe the answer is:
crimea
'black sea peninsula' is the definition.
(I've seen this before)
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)" .)