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