Crossword Genius

Mineral one removed from green box (8)

Ross

I believe the answer is:

feldspar

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'mineral' is the definition.
(feldspar is a kind of mineral)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for feldspar that I've seen before include "Large wading bird" , "Mineral; red flaps (anag.)" , "Abundant mineral" , "Common mineral" , "crystal" .)

I've seen this clue in The Telegraph.
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