Bluish-white metallic element; symbol Zn (4)

I believe the answer is:

zinc

(Other definitions for zinc that I've seen before include "Sivery-white metal" , "Blusish-white lustrous metallic element" , "Penultimate element (alpha. order)" , "It is used to coat iron against corrosion" , "Metal much used in alloys" .)

I've seen this clue in The Mirror.

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