Alloy with its own age (6)

I believe the answer is:

bronze

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'alloy' is the definition.
(I know that bronze is a type of copper-base alloy)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Mirror.

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