One for placing behind the silver? (6)

I believe the answer is:

bronze

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'the silver?' is the definition.
(thesaurus)

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

(Other definitions for bronze that I've seen before include "Tan; metal alloy" , "Hard alloy suitable for casting" , "Third place medal" , "Third-place medal" , "Popular alloy for sculptures" .)

I've seen this clue in The Guardian.

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