Philosopher who described friendship as "a single soul dwelling in two bodies" (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" , "noted thinker" , "Totaliser (anag) - ancient Greek" , "Realist to be like great Greek philosopher" , "Philosopher - treats oil (anag)" .)

I've seen this clue in the Universal.

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