Novel ID (4)
I believe the answer is:
isbn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">novel id</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for isbn that I've seen is " Literary code".)
I've seen this clue in the New York Times, the Newsday.com, the Universal, the Thinks.com, the Wall Street Journal and the Newsday.
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