Canal boats (6)
I believe the answer is:
barges
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">canal boats</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 barges that I've seen before include "Long boats on inland waterways" , "Canal boats, used to be towed along" , "Longboats on inland waterways" , "Broad flat-bottomed boats" , "Inland waterway boats" .)