Hard metal element (7)

I think it could be either:

Which length description are you looking for?:

iridium

'hard metal element' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for iridium that I've seen before include "number 77" , "Silvery-white metallic element" , "Colourful compounds come from this" , "Hard metal element, Ir" , "Metallic element resistant to corrosion, atomic no. 77" .)

I've seen this clue in The Times.

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