Crossword Genius

Keep preserving the standard (5)

Ross

I believe the answer is:

canon

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'the standard' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for canon that I've seen before include "senior cleric" , "General principle or kind of clergyman" , "Criterion; church official" , "Ecclesiastical rule" , "Principle; list of recognised works" .)

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