Metallic derivative of platinum (3)

I believe the answer is:

tin

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'metallic' is the definition.

'of platinum' is the wordplay.
'of' indicates a hidden word.
'TIN' is hidden in the letters of 'platinum'.

'derivative' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

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(Other definitions for tin that I've seen before include "With copper, makes bronze" , "1 down, symbol Sn" , "A silvery-white metal, symbol Sn" , "Element, symbol Sn" , "Silver-white metal, used to make cans" .)

I've seen this clue in the Evening Standard.

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