Crossword Genius

Often exemplary individual (3)

Ross

I believe the answer is:

one

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'individual' is the definition.
(an individual is one person)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for one that I've seen before include "SECOND PART OF 16" , "Leading cardinal" , "Single, sole" , "doesn't count for much" , "Unit" .)

I've seen this clue in the Evening Standard.
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