Slip put right near the back of a book (7)
I believe the answer is:
erratum
'slip' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for erratum that I've seen before include "A mistake in printed matter" , "Slip" , "Misprint" , "Published correction" , "Printer's mistake" .)