Crossword Genius

Of first importance (5)

Ross

I believe the answer is:

prime

'of first importance' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for prime that I've seen before include "Brief" , "Foremost" , "put in the picture" , "Main; make ready" , "2017, for example" .)

I've seen this clue in The Times.
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