Crossword Genius

Back-of-the-book reference (5)

Ross

I believe the answer is:

index

(Other definitions for index that I've seen before include "A-to-Z listing" , "Sign of something" , "Table of book's contents" , "Alphabetical listing and first finger" , "Alphabetical list of items" .)

I've seen this clue in the Family Time and the Universal.
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