Crossword Genius

Black ball (5)

Ross

I believe the answer is:

eight

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

(Other definitions for eight that I've seen before include "Crew of racing shell" , "Cube root of five hundred and twelve" , "may be cut out of ice" , "Mathematical cube" , "power of two" .)

I've seen this clue in the L.A. Times Daily, The New York Times, the Newsday.com and the Wall Street Journal.
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