Crossword Genius

Member of a British socialist organisation founded in 1884 (6)

Ross

I believe the answer is:

fabian

(Other definitions for fabian that I've seen before include "Sainted pope" , "[SLEUTH]" , "one joining 10 27 21 [INDEPENDENT LABOUR PARTY] ?" , "Patient left winger" , "cautious" .)

I've seen this clue in The Guardian.
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