One letting off steam in kitchen? (6)
I believe the answer is:
kettle
'one letting off steam' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
(Other definitions for kettle that I've seen before include "Spouted vessel" , "Check elements causing trouble in demonstration" , "The pot may call this black" , "Kitchen container and type of drum" , "Domestic appliance that can whistle?" .)