Sooty shaft (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sooty shaft</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 flue that I've seen before include "Conduit for smoke" , "Duct for smoke/gases" , "Air vent" , "Chimney shaft" , "Fume vent" .)
(Other definitions for chimney that I've seen before include "Smoke vent" , "Father Christmas's entry?" , "Smoke pipe; rock cleft" , "Smoker on the roof?" , "Flue" .)