### Clue: Books in the same place, with litter strewn about (8)
### Answer: LIBRETTI 
 ### Explanation: Definition: Books
 IB(short for "ibid", Latin for "in the same place", used in text to indicate reference to the same source mentioned in a previous reference) **contained in**(with … about) **anagram of**(… strewn) LITTER.
Defn: … of the text of an opera or other long vocal work.