Crossword Genius

Popular group not selected for Pixar film (6,3)

Ross

I believe the answer is:

inside out

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'popular' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for inside out that I've seen before include "turned the wrong way" , "how expert knows his trade?" , "Turned to show the inner surface" , "exposing the wrong face?" , "reversal of normal" .)

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