Crossword Genius

Doctrine of equable return (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 how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tenet that I've seen before include "A palindromic doctrine or creed" , "A belief or credo - it's a palindrome" , "A religious doctrine proclaimed as true without proof" , "A belief or creed - a palindrome" , "Article of belief" .)

I've seen this clue in the Evening Standard.
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