Black/green colour (5)

I believe the answer is:

blush

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the remainder of the clue.

(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.

Want a hint initially instead of a full solution? Install my app