Crossword Genius

Rich colour (not black) (4)

Ross

I believe the answer is:

lush

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'rich' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for lush that I've seen before include "Slang drunkard like rich growth" , "Of grass, growing thickly and strongly" , "Succulent - soak" , "sponge" , "Growing luxuriantly, grass say" .)

I've seen this clue in The Hindu.
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