Gold, perhaps, as used in industry? (4)

I believe the answer is:

dust

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'gold perhaps as used in industry?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'in industry?' is the wordplay.
'in' indicates a hidden word.
'DUST' is hidden within 'industry'.

Can you help me to learn more?

(Other definitions for dust that I've seen before include "Fine dirt particles" , "Powdery matter" , "Unwanted fine powder" , "Microscopic particles in the air" , "Sprinkle -- powder" .)

I've seen this clue in the Evening Standard.

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