Platonic scholar is said to be concealing birthplace of The Last of the Academic Sceptics
(7)L?R?S?? The last letter is the same as the last letter of 20d above
Silly me, I'm usually better than that! Perhaps you could explain why Philomena is the answer to 25a Greene's Attic bird(9)P?I?O?E?A (besides the fact that it fits!)