### Clue: Langley folks love Berlusconi's farewell (4)
### Answer: CIAO 
 ### Explanation: Definition: Berlusconi's farewell
 CIA(abbrev. for the US Central Intelligence Agency headquartered in Langley, Virginia) + O(the letter representing 0;love in tennis scores).
Answer: Farewell as said by Berlusconi and his Italian compatriots.