Beliefs, philosophies (4)
I believe the answer is:
isms
I believe this clue is a double definition.
'beliefs' is the first definition.
(ism is a kind of belief)
'philosophies' is the second definition.
('ism' can be a synonym of 'philosophy')
(Other definitions for isms that I've seen before include "Distinctive doctrines" , "Informal doctrines - near miss" , "'Beliefs, philosophies (4)'" , "Distinctive theories" , "Informal suffixes for doctrines or practices, confused miss (4)" .)