Duct (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">duct</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pipe that I've seen before include "Water carrier" , "Wine cask; sing shrilly" , "Something in the organ loft" , "Whistle" , "Tube; wind instrument" .)
(Other definitions for tube that I've seen before include "Underground transport" , "London Underground or long cylinder" , "Can of beer (colloquial)" , "Pipe - railway" , "Pipe (with trains?)" .)