What does the cryptic crossword clue "Homework covering principal rule of two (7)" mean?

The definition is "rule of two". The wordplay uses a container (one word inside another). ARCH (synonym="‘principal’") in DIY (synonym="Do It Yourself, ‘homework’") = DIARCHY; definition: "rule of two" The answer is DIARCHY.

Homework covering principal rule of two (7)

Guardian Cryptic #28922 | 17 Down | 2022-11-23 flower

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