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