Swedish-American film actress, whose last film appeared in 1942, d. aged 84 in 1990 (5)
I believe the answer is:
garbo
(Other definitions for garbo that I've seen before include "film star? Yes and no" , "Greta -, Swed. actress" , "Greta . . . . ., film star who wanted to be alone" , "Reclusive film star" , "film-star" .)