Oscar received by actress cast as philosopher (8)
I believe the answer is:
socrates
'philosopher' is the definition.
(I know that Socrates is a philosopher)
'oscar received by actress cast' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'received by' indicates putting letters inside.
'cast' is an anagram indicator (letters are dispersed or cast around).
'actress' anagrammed gives 'scrates'.
'o' put inside 'scrates' is 'SOCRATES'.
'as' acts as a link.
(Other definitions for socrates that I've seen before include "Hemlocked philosopher" , "2 [PHILOSOPHER]" , "Athenian philosopher who was teacher to Plato" , "Man philosophically questioning" , "Coarsest one of great Greek philosophers" .)