Crossword Genius

A prime number (8)

Ross

I believe the answer is:

nineteen

'a prime number' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for nineteen that I've seen before include "Roman XIX" , "Prime number" , "not quite the full score" , "19" , "Upper age limit for 2 Down" .)

I've seen this clue in the Sydney Morning Herald.
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