Sea-girt land (4)
I believe the answer is:
isle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sea-girt land</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 isle that I've seen before include "Eg, Iona" , "cut-off location" , "one has water all round" , "Eg, eyot or inch" , "Man's one" .)