Crossword Genius

Whistler, perhaps confined by police, disposing of diamonds (6)

Ross

I believe the answer is:

kettle

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

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

Can you help me to learn more?

(Other definitions for kettle that I've seen before include "Eurydice's husband" , "Drum and metal pot" , "Water boiler" , "Kitchen container and type of drum" , "Container for boiling water" .)

I've seen this clue in The Telegraph.
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