Crossword Genius

One cosily covered?

Ross

I believe the answer is:

teapot

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for teapot that I've seen before include "Spouted vessel" , "Cuppa brewer" , "Hot drink dispenser" , "Tao pet (anag)" , "Peat to brew leaves in" .)

I've seen this clue in the Evening Standard.
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