Basement fixture (6)
I believe the answer is:
boiler
'basement fixture' is the definition.
(I've seen this in another clue)
This is all the clue.
(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" .)