Crossword Genius

"The loneliest number" (3)

Ross

I believe the answer is:

one

'the loneliest number' 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 "Leading cardinal" , "joke" , "Individual" , "doesn't count for much" , "SECOND PART OF 16" .)

I've seen this clue in the USA Today and the Universal.
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