Ship's smokestack (6)
I believe the answer is:
funnel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ship's smokestack</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 funnel that I've seen before include "Cone-shaped utensil and ship's smokestack" , "Smokestack on ship" , "Kind of conduit for pouring liquid into small opening" , "Chimney; pourer" , "Steam engine chimney" .)