1939 romcom starring Greta Garbo in the title role (9)
I believe the answer is:
ninotchka
(Other definitions for ninotchka that I've seen before include "China knot (anag) - film with Garbo" , "Garbo role in film" , "1939 Greta Garbo film" , "Greta Garbo nineteen thirty nine film" .)