Journey by water (6)
I believe the answer is:
voyage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">journey by water</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 voyage that I've seen before include "Ocean trip" , "See 7" , "Journey by water or through space" , "Travel by water" , "tour" .)