Put favourable slant on two levels about unknown philosopher (7)
I believe the answer is:
spinoza
'philosopher' is the definition.
(Baruch Spinoza)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for spinoza that I've seen before include "philosophical sort" , "C17 Dutch philosopher" , "Dutch 17th-century philosopher" , "2 [PHILOSOPHER]" .)