### Clue: Smiley's group jams here in central London? (9,6)
### Answer: CAMBRIDGE CIRCUS 
 ### Explanation: Definition: jams here in central London
 Cryptic defn: Reference to John Le Carre's creation, George Smiley and his group of British intelligence agents, nicknamed The Circus, headquartered in a building on the corner of this Central London traffic roundabout.
Or you could consider this a double definition, with "jams here" doing double duty?