What does the cryptic crossword clue "Maintain preservation - that’s the rule (5)" mean?

The definition is "rule". The wordplay uses a charade (building blocks). CAN (synonym="CAN") + ON (synonym="continue to put in cans to preserve food; maintain preservation") = CANON; definition: "rule" The answer is CANON.

Maintain preservation - that’s the rule (5)

Independent Cryptic #11786 | 21 Down | 2024-07-19 flower

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