Crossword Genius

Essential (5)

Ross

'essential' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for prime that I've seen before include "Fundamental - of highest quality" , "(Of number) divisible only by itself and one" , "At least two" , "Monastic service; best quality" , "Best - get ready" .)

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