Clue: Left, waving "au revoir, Nice" le superstar de Cannes? (8,7)
Answer: LAURENCE OLIVIER
Explanation: Definition: superstar de Cannes?

**L **(left) + ***(au revoir nice le)** [anag:*waving*]
 

 
*Not aware of any particular link between Cannes and Olivier, but according to the Cannes Festival website, five of his movies have been presented at the Festival.