Crossword Genius

Mark of perfection (3)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mark of perfection</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Newsday, The Wall Street Journal and The New York Times.
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