Clue: Nothing to support idea propagated by books and film (7)
Answer: MEMENTO
Explanation: Definition: film
 O(letter representing 0/nothing) **placed below**(to support, in a down clue) [ MEME(an idea that spreads within a culture by imitation) **plus**(by) NT(abbrev. for the New Testament, a collection of books in the Bible) ].
Defn: A 2000 mystery thriller ….