Crossword Genius

Metallic element and essential trace mineral (4)

Ross

I believe the answer is:

zinc

(Other definitions for zinc that I've seen before include "Blue-white metallic element, atomic number 30" , "coat for protection" , "Antioxidant element" , "Metal much used in alloys" , "Constituent of brass" .)

I've seen this clue in The Guardian.
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