Crossword Genius

Choice includes a base metal or precious one (8)

Ross

I believe the answer is:

platinum

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'precious one' is the definition.
I know that 'precious' relates to this answer. I also know that both the answer and definition are singular nouns

'choice includes a base metal' is the wordplay.
'choice' becomes 'plum' (both can mean excellent).
'includes' means one lot of letters goes inside another.
'base metal' becomes 'tin' (tin is a kind of metal. I am not sure about the 'base' bit.).
'a'+'tin'='atin'
'plum' placed around 'atin' is 'PLATINUM'.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for platinum that I've seen before include "Atomic number 78" , "Metal used in jewellery" , "Precious metal; sort of blonde" , "Heavy precious metallic element" , "Valuable stuff, after a grind" .)

I've seen this clue in The Times.
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