"Republic" philosopher (5)
I believe the answer is:
plato
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">republic philosopher</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for plato that I've seen before include "Greek character" , "Teacher of Aristotle, pupil of Socrates" , "Republic author" , "A plot (anag) (known to Aristotle?)" , "Ancient Greek philosopher" .)