Clue: Fabulous Greek girl dined during festival (7)
Answer: GALATEA
Explanation: Definition: Fabulous Greek girl

**ATE** ("dined") *during* **GALA** ("festival")
 

 
There are three different Galateas in Greek mythology, including the statue created by Pygmalion, a nereid who loved a shepherd, and a mother who asked the gods to turn her daughter into a son.