Wolfram in tents gnu ransacked (8)

I believe the answer is:

tungsten

(Other definitions for tungsten that I've seen before include "Snug tent (anag)" , "Chemical element, symbol W" , "Greyish-white metal used in lamp filaments" , "Metallic element, W" , "Lamp filament metal" .)

I've seen this clue in The Sun.

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