Filmdom's Garbo (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
greta
(Other definitions for greta that I've seen before include "The familiar Ms Garbo, solitary film star" , "'I want to be alone' - ?.. Garbo (5)" , "Miss Garbo" , "- Garbo, Swedish actress" , "Girl" .)