Goes by boat (5)
I believe the answer is:
sails
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">goes by boat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(travels in a boat with sails)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sails that I've seen before include "Navigates" , "Goes by sea" , "Ship's canvas" .)