Water heater (6)
'water heater' 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 "Device for heating water" , "Container to heat water or tough fowl" , "Water heater" , "Water-heater" , "tough old bird" .)
'water heater' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kettle that I've seen before include "Water-boiler" , "In which to boil water or cook fish" , "Container for boiling water" , "Vessel for boiling water" , "Drum and metal pot" .)
(Other definitions for teakettle that I've seen before include "Vessel for boiling water" , "Kitchen item" , "Kitchen appliance" , "Boiler" .)