Of the sea (6)
I believe the answer is:
marine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of the sea</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for marine that I've seen before include "Relating to the sea" , "'Nautical, maritime (6)'" , "Soldier serving on land and sea" , "jolly" , "Member of the forces" .)