Crossword Genius

Black/green colour (5)

Ross

I believe the answer is:

blush

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'colour' is the definition.
(blushing is a kind of colouring)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for blush that I've seen before include "Redden (in the face)" , "Pinkish type of wine" , "Redden in shame or modesty" , "look embarrassed" , "Turn red, in embarrassment or shame" .)

I've seen this clue in The Hindu.
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