Crossword Genius

Rubik's brain-teaser (4)

Ross

I believe the answer is:

cube

(Other definitions for cube that I've seen before include "Three-dimensional figure" , "Rubik invented a puzzling one" , "Die" , "In maths, the third power of a quantity" , "Square-sided body" .)

I've seen this clue in the King Feature Syndicate.
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