Crossword Genius

Novel ID (4)

Ross

I believe the answer is:

isbn

'novel id' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Another definition for isbn that I've seen is " Literary code".)

I've seen this clue in the Universal, the Thinks.com, the Wall Street Journal, the New York Times and the Newsday.com.
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