What does the cryptic crossword clue "More disapproving of Mike opening elementary book (7)" mean?

The definition is "book". The wordplay uses a container (one word inside another). M (synonym="Mike in the NATO alphabet") in PRIMER (synonym="elementary [text]book") = PRIMMER The answer is PRIMMER.

More disapproving of Mike opening elementary book (7)

Guardian Cryptic #29638 | 18 Down | 2025-03-10 flower

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