Crossword Genius

Miss out certain doctrines (4)

Ross

I believe the answer is:

isms

I'm a little stuck... Click here to teach me more about this clue!

'certain doctrines' is the definition.
'isms' can be an answer for 'doctrines' ('ism' can be a synonym of 'doctrine'). I am unsure of the 'certain' bit.

'miss out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'miss' is an anagram of 'ISMS'.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.
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