Black Sea peninsula (6)
I believe the answer is:
crimea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">black sea peninsula</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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)" .)