Founder of Stoicism
I believe the answer is:
zeno
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">founder of stoicism</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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)" .)