Crossword Genius

A case of identical twins! (3)

Ross

I believe the answer is:

pod

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'a case' is the definition.
(pod is a kind of case)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pod that I've seen before include "Elongated seed case" , "Hull" , "A seedcase; some whales" , "A pea grows in it" , "Peas grow in one" .)

I've seen this clue in the Evening Standard.
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