Ocean voyage (6)
(Other definitions for passage that I've seen before include "Piece of writing" , "Sea/air journey" , "Transit - part of book etc" , "Book extract; transit" , "Way through; part of text" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ocean voyage</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cruise that I've seen before include "Holiday at sea" , "Tour by ship" , "Coast" , "Voyage for holiday makers" , "Shipboard holiday" .)