Crossword Genius

Endless criticism involving old philosopher (5)

Ross

I believe the answer is:

stoic

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'philosopher' is the definition.
(type of ancient philosopher)

I don't understand how the rest of the clue works.

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(Other definitions for stoic that I've seen before include "he's not complaining" , "Impassive type" , "Unemotional" , "Athenian philosopher" , "One patient under misfortune" .)

I've seen this clue in The Telegraph.
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