Hard metal (8)
'hard metal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tungsten that I've seen before include "Hard metal used in light bulb filaments" , "Steel-grey metal" , "Hard malleable metal" , "Greyish-white metal used in lamp filaments" , "Metallic element used for lamp filaments" .)
(Other definitions for steel that I've seen before include "Strength, determination" , "Mixture of carbon and iron" , "Iron/carbon alloy" , "Hard, strong, grey alloy" , "Knife-sharpener" .)
'hard metal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for iridium that I've seen before include "Hard metal element, Ir" , "Silvery-white metallic element" , "Hard metallic element" , "Hard silvery metal" , "Element, symbol Ir" .)