Crossword Genius

The loneliest number, it's said (3)

Ross

I believe the answer is:

one

'the loneliest number it's said' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for one that I've seen before include "doesn't count for much" , "Half of two" , "1" , "time" , "I can mean this" .)

I've seen this clue in the Universal.
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