Mediterranean or Baltic (3)
I believe the answer is:
sea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mediterranean or baltic</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 sea that I've seen before include "Cause of flooding" , "E.g Aral or Weddell" , "Lesser ocean" , "North, say" , "Cod's home?" .)