Crossword Genius

Singer letting off steam (6)

Ross

I believe the answer is:

kettle

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'singer letting' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'steam' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'off' acts as a link.

Can you help me to learn more?

(Other definitions for kettle that I've seen before include "Container for heating 10" , "In which to boil water or cook fish" , "Vessel for boiling liquids" , "Water-boiler" , "Check elements causing trouble in demonstration" .)

I've seen this clue in The Globe and Mail.
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