Basement fixture (6)
I believe the answer is:
boiler
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">basement fixture</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 boiler that I've seen before include "Container to heat water or tough fowl" , "Steam-producer" , "Container for heating water or a tough fowl" , "Water-heater" , "tough old bird" .)