On the ocean (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">on the ocean</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 at sea that I've seen before include "in the Med?" , "Travelling" , "on a boat?" , "Having difficulty understanding" , "disorientated" .)