Crossword Genius

Mark of perfection (3)

Ross

I believe the answer is:

'mark of perfection' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ten that I've seen before include "Dudley Moore/Bo Derek film" , "Very young" , "Half a score" , "Five times two" , "Cardinal number" .)

I've seen this clue in The New York Times and The Wall Street Journal.
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