Go by sea (4)
I believe the answer is:
sail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go by sea</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 sail that I've seen before include "Spanker, say" , "Sheet used to catch the wind" , "Canvas on board" , "Ship's canvas" , "Canvas sheet" .)