Before sun at zenith, bringer of light travelling east in principle (5)

I believe the answer is:

dogma

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'principle' is the definition.
(I know that dogma is a type of principle)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dogma that I've seen before include "Code of beliefs accepted as authoritative" , "Item of belief" , "Opinion viewed as truth?" , "Set of beliefs" , "Doctrine accepted as true without proof" .)

I've seen this clue in The Times.

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