Crossword Genius

In the mirror, the outside appears reversed (3)

Ross

I believe the answer is:

rim

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But I can't explain it at all! Could you help me understand?

(Other definitions for rim that I've seen before include "An edge, canyon or cup" , "Outer edge of a wheel" , "Raised edge of a round object" , "Curved edge" , "'Brim, lip (3)'" .)

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