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 Independent, the Penny Press, The Sun, the Evening Standard, The Mirror, The Times, The Telegraph, the King Feature Syndicate, the USA Today, The Irish Independent, The Guardian and the Sydney Morning Herald.
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