Actress ____ Dietrich (7)
I believe the answer is:
marlene
'actress dietrich' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for marlene that I've seen before include "The late ....... Dietrich, German singer and film star" , "- Dietrich, Ger. actress" , "....... Dietrich, German-born film and stage star" .)