Largest inland sea (7)
I believe the answer is:
caspian
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">largest inland sea</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for caspian that I've seen before include "-- Sea, inland lake" , "Prince --, Narnia book" , "World's largest inland sea" .)