Ductile greyish-white element; symbol W (8)

I believe the answer is:

tungsten

(Other definitions for tungsten that I've seen before include "Element used in steels" , "Hard metal used in lamps etc" , "Steel-grey metal" , "Metallic element in a strangely snug tent" , "Greyish-white metal used in lamp filaments" .)

I've seen this clue in The Mirror.

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