Copper alloy (6)

I think it could be either:

Which length description are you looking for?:

bronze

I believe this is a double definition.

'copper' is the first definition.
(thesaurus)

'alloy' is the second definition.
(bronze is a kind of alloy)

(Other definitions for bronze that I've seen before include "Third-place medal" , "Get a tan" , "Third place medal" , "Tan; metal alloy" , "Third place - alloy" .)

I've seen this clue in The Telegraph.

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