Alloy of copper and zinc (5)

I think it could be either:

Which length description are you looking for?:

brass

'alloy of copper and zinc' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for brass that I've seen before include "Alloy (associated with muck)" , "Impertinence" , "instrumental group" , "Alloy of copper and zinc" , "Nerve (but not of steel!)" .)

I've seen this clue in the Sydney Morning Herald, The Telegraph, the LA Times and The Times.

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