Kind of tape (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kind of tape</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for duct that I've seen before include "Pipe, tube" , "Enclosed conduit for fluid" , "Pipe for cables or air" , "Tube for cables, air, etc" , "Tube, passageway" .)