Crossword Genius

Prime number (5)

Ross

There are a few possibilities for this:

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5

6 10

'prime number' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for seven that I've seen before include "Number (of stars in the sky?)" , "So many ages of man (AYLI)" , "number of swans aswimming" , "Number of Wonders of the World" , "equivalent of uproar [7D]" .)

I've seen this clue in the Penny Press and The Times.
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