Crossword Genius

Essential (5)

Ross

(Other definitions for basis that I've seen before include "Foundation of a theory or process" , "Fundamental part" , "Underlying support (for an idea)" , "First principle" , "Reason" .)

I've seen this clue in the Sydney Morning Herald, the King Feature Syndicate, The Sun, the Penny Press, The Independent, The Guardian, The Irish Independent, The Mirror, The Times, The Telegraph and the Evening Standard.
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