A container in choice metal (8)

I believe the answer is:

platinum

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'metal' is the definition.
(I know that platinum is a type of precious metal)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for platinum that I've seen before include "Valuable stuff, after a grind" , "-- Blonde; -- disc" , "Valuable substance" , "Precious silvery-white metal" , "Atomic number 78" .)

I've seen this clue in The Sun.

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