Artist's boiling kettle? (8)

I believe the answer is:

whistler

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This could be a double definition.

'artist's' is the first definition.
(painter James McNeill Whistler)

'boiling kettle?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for whistler that I've seen before include "American painter, 1834-1903" , "Olympic ski resort" , "American-born Victorian artist" , "Siffleur - US painter, d. 1903" , "referee" .)

I've seen this clue in The Telegraph.

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