Clue: What's sought by Smiley and Scarecrow? (12)
Answer: INTELLIGENCE
Explanation: What's sought by Smiley and Scarecrow? (12)
Double/cryptic definition: George Smiley, the intelligence officer in many of John le Carré's novels, and the Scarecrow who was looking for a brain in *The Wonderful Wizard of Oz* by L Frank Baum- and, again, other books by the same author.