Crossword Genius

End of class? (3)

Ross

I believe the answer is:

ism

(Other definitions for ism that I've seen before include "Unspecified doctrine" , "Informal doctrine found in Bismarck" , "Any branch of philosophy" , "Suffix denoting doctrine or practise" , "Suffix denoting doctrine or practice" .)

I've seen this clue in The New York Times.
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