Crossword Genius

Key (B not A, then E) going to pot (8)

Ross

I believe the answer is:

crucible

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'to pot' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for crucible that I've seen before include "smelting vessel" , "Metal-melting container" , "Vessel for melting metals" , "Melting pot" , "severe test" .)

I've seen this clue in The Guardian.
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