### Clue: Teller of jokes — one of which in here? (7)
### Answer: CRACKER 
 ### Explanation: Definition: Teller of jokes,one of which in here
  Double defn: 1st: What you might call one who tells/cracks jokes; and 2nd: "here" in the clue, that which releases a joke (or toy or paper hat) when pulled apart, usually done during Christmas festivities.