Crossword Genius

What "X" might mean (3)

Ross

I believe the answer is:

ten

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">what x might mean</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 "Base of decimal system" , "Roman numeral X" , "PM's address, Downing St" , "time" , "Half a score" .)

I've seen this clue in The New York Times and the USA Today.
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