Philosophies (4)

I believe the answer is:

isms

'philosophies' is the definition.
('ism' can be a synonym of 'philosophy')

This is all the clue.

(Other definitions for isms that I've seen before include "Informal doctrines - near miss" , "Informal suffixes for doctrines or practices, confused miss (4)" , "Distinctive doctrines" , "Distinctive theories" , "'Beliefs, philosophies (4)'" .)

I've seen this clue in The Wall Street Journal, the Ink Well xwords, the L.A. Times Daily, The Chronicle of Higher Education, The Washington Post and the New York Times.

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