Copper, zinc and tin alloy (6)

I believe the answer is:

ormolu

(Other definitions for ormolu that I've seen before include "Gold-coloured alloy used to decorate furniture" , "Ornamental gold alloy" , "Brass resembling gold" , "Gold-coloured alloy used for decorating furniture etc" , "Gold-coloured ally used in decoration" .)

I've seen this clue in The Sunday Times and The Times.

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