Crossword Genius

Either of those identical Green twins! (3)

Ross

I believe the answer is:

pea

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'green twins' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for pea that I've seen before include "Seed eaten as vegetable" , "Leguminous seed" , "Tiny stone" , "Leguminous vegetable" , "Ape this plant awkwardly" .)

I've seen this clue in the Evening Standard.
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