Doctrine you can read up (5)

I believe the answer is:

tenet

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'doctrine' is the definition.
(tenet is a kind of doctrine)

I don't understand the rest of the clue.

(Other definitions for tenet that I've seen before include "Dogma or principle" , "A belief or creed - a palindrome" , "It's believed" , "Belief held as true" , "Fundamental belief" .)

I've seen this clue in the Evening Standard.

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