Founder of Stoicism
I believe the answer is:
zeno
'founder of stoicism' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for zeno that I've seen before include "Gr. philosopher of Elea" , "Gr. philosopher (-'s paradoxes); zone (anag.)" , "Old mathematician" , "Greek philosopher of paradox fame" , "Greek philosopher of Elea (paradoxes)" .)