Crossword Genius

A Whistler in the kitchen? (6)

Ross

I believe the answer is:

kettle

'a whistler' is the definition.
(a kettle whistles when it boils)

I don't understand how the rest of the clue works.

(Other definitions for kettle that I've seen before include "Container for boiling water" , "Contain demonstrators" , "Kitchen boiler?" , "Vessel for boiling water" , "One called black by pot" .)

I've seen this clue in The Times.
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