Land in sea (4)
I believe the answer is:
isle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">land in sea</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 isle that I've seen before include "Man conceivably" , "Lilliput, say" , "Capri or Man, perhaps?" , "Man's one" , "Eg, Sheppey" .)