Book spine info (5)
I believe the answer is:
title
'book spine info' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for title that I've seen before include "Deed showing legal right to a property" , "Mr or Mrs, say" , "Sign of nobility or name of a work" , "Name - sign of rank" , "Name of book or lord" .)