Crossword Genius

Doctrine unaffected by revolution? (5)

Ross

I believe the answer is:

tenet

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'doctrine' is the definition.
(both can mean a belief or value)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tenet that I've seen before include "Fundamental belief" , "A belief or creed - a palindrome" , "Article of faith; doctrine" , "Conviction" , "Key principle" .)

I've seen this clue in The Times.
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