Clue: Socratic method so revolutionary for 1 of 8 here (4)
Answer: QAOS
Explanation: Definition: 1 of 8 here
Q [&] A (the Socratic method of question and answer) + reverse of SO, and this is the last of the eight setters in the puzzle; Qaos and Enigmatist are the only two to be defined as setters: by necessity, as their pseudonyms are not "real words". *In fact Enigmatist is a real word – see Robi's comment