Crossword Genius

Subject of the children's book "The Z Was Zapped" (4)

Ross

I believe the answer is:

abcs

(Other definitions for abcs that I've seen before include "12 [THINGS EASY]" , "guides ..." , "Know these letters to be well informed" , "Know these to be well versed - alphabetically?" .)

I've seen this clue in The Washington Post.
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