Crossword Genius

Fundamental (5)

Ross

(Other definitions for prime that I've seen before include "Maybe eleven" , "Number such as two, three, five, seven, etc" , "Prepare for use, say a pump" , "Main; make usable" , "Capital - of first importance" .)

I've seen this clue in The Irish Times, The Telegraph, the Sydney Morning Herald, the Newsday, The Mirror, The Star Tribune, The Times, the Evening Standard, the King Feature Syndicate and the LA Times.
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