Crossword Genius

Do the math (6)

Ross

I believe the answer is:

cipher

(Other definitions for cipher that I've seen before include "Key to a code" , "Code - 0" , "Person or thing of no importance, or the symbol 0" , "Symbol representing nought, thing of no importance" , "Nonentity" .)

I've seen this clue in the Newsday.
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