Treat soil (anag) — Greek philosopher (9)

I believe the answer is:

aristotle

(Other definitions for aristotle that I've seen before include "Totaliser for the great Greek philosopher of old" , "Greek logician" , "Philosopher - treats oil (anag)" , "Greek philosopher (Poetics, Politics)" , "Totaliser (anag) - ancient Greek" .)

I've seen this clue in The Guardian.

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