Crossword Genius

A prime number (8)

Ross

I believe the answer is:

nineteen

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a prime number</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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