Metal shaving twisted internally (6)

I believe the answer is:

silver

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'metal' is the definition.
(silver is a kind of metal)

I cannot understand how the rest of the clue works.

(Other definitions for silver that I've seen before include "Precious metal, Ag" , "Movies" , "Argent" , "Pirate" , "Silver of precious metal" .)

I've seen this clue in The Times.

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