Crossword Genius

Richard's red gave green in this! (6)

Ross

I believe the answer is:

indigo

'green in this' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

I can't explain the rest of the clue.

(Other definitions for indigo that I've seen before include "Blue-purple colour in spectrum" , "Deep violet-blue colour" , "Blue dyestuff" , "Deep-blue dye or colour" , "Tropical plant" .)

I've seen this clue in The Independent.
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