Crossword Genius

Black ball (5)

Ross

I believe the answer is:

eight

'black ball' is the definition.
(I've seen this in another clue)

This is all the clue.

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