Tin-based alloy (6)

I believe the answer is:

pewter

(Other definitions for pewter that I've seen before include "Tin alloy for utensils" , "Alloy mainly of tin and lead" , "Grey alloy of tin and lead, makes mugs etc." , "Silver-grey alloy" , "Alloy of tin with copper and antimony" .)

I've seen this clue in The Times.

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