Travel by ship (4)
I believe the answer is:
sail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">travel by ship</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 sail that I've seen before include "Sheet used to catch the wind" , "Go by boat" , "Leave shore" , "Canvas sheet" , "Canvas on board" .)