Crossword Genius

Rigidly old-fashioned (6)

Ross

I think it could be either:

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5

6

square

(Other definitions for square that I've seen before include "Level - shape - piazza - stuffy" , "Centre of cricket ground" , "uncool" , "Type of rectangle" , "New York Times, for example" .)

I've seen this clue in The Guardian.
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