Crossword Genius

It's green, yes, with a bit of a red back (4)

Ross

I believe the answer is:

jade

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

'it's green' is the definition.
(jade green is a kind of green)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for jade that I've seen before include "Wear down" , "Semiprecious stone - exhaust" , "horse not in prime condition" , "Ornamental semiprecious stone" , "Mount" .)

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