Metal used in light bulb filaments (8)

I believe the answer is:

tungsten

(Other definitions for tungsten that I've seen before include "Very hard metal, used in light bulbs" , "Greyish-white metal used in lamp filaments" , "Element used in electric light filaments" , "Hard metal used in lamps etc" , "Chemical element, symbol W" .)

I've seen this clue in The Guardian.

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