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 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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