Slim and wealthy actress (8)
I believe the answer is:
dietrich
'actress' is the definition.
(I have seen 'Former actress' mean 'dietrich' so perhaps 'actress' could also mean 'dietrich')
'slim and wealthy' is the wordplay.
'slim' becomes 'diet' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'wealthy' becomes 'rich' (similar in meaning).
'diet'+'rich'='DIETRICH'
Can you help me to learn more?
(Other definitions for dietrich that I've seen before include "Marlene ..., German-born film star" , "Marlene . . . . . . . ., late German star of stage and screen" , "FILMSTAR" , "Marlene . . . . . . . . was a famous film star" , "Marlene ... old film star" .)