Form of gold used in industry (4)
I believe the answer is:
dust
'form of gold' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe there's a link between them I don't understand?
'in industry' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DUST' can be found hidden inside 'industry'.
'used' acts as a link.
Can you help me to learn more?
(Other definitions for dust that I've seen before include "Powdery matter" , "Fine powdery material that can be blown about in the air" , "Microscopic particles in the air" , "Tiny particles of dirt, skin flakes etc" , "Do household cleaning" .)