Athenian philosopher (8)
I believe the answer is:
socrates
'athenian philosopher' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for socrates that I've seen before include "Coarsest sort of Greek philosopher" , "2 [PHILOSOPHER]" , "Deep thinker" , "Coarsest one of great Greek philosophers" , "Athenian philosopher who was teacher to Plato" .)