Crossword Genius

Black gold from Chicago, Illinois (3)

Ross

I believe the answer is:

oil

(Other definitions for oil that I've seen before include "Thick liquid that doesn't dissolve in water" , "Slippery liquid" , "Viscous substance as lubricant" , "Greasy liquid" , "Fuel, lubricant" .)

I've seen this clue in The Sun.
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