Crossword Genius

On TV, there's one named Albert (6)

Ross

I believe the answer is:

square

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

(Other definitions for square that I've seen before include "Type of rectangle" , "Figure with four equal sides" , "Right-angled; plaza" , "bashed by soldiers in training?" , "Stick-in-the-mud -- quadrangle" .)

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