What does the cryptic crossword clue "It's not so acceptable in top class, book being added to wrong set? (7)" mean?

The definition is "It’s not so". The wordplay uses a charade (building blocks). U (synonym="acceptable in top class") + NT (synonym="wrong set = New Testament") + RUTH (synonym="Old Testament book") = UNTRUTH; definition: "It's not so" The answer is UNTRUTH.

It's not so acceptable in top class, book being added to wrong set? (7)

Times Cryptic #28613 | 20 Across | 2023-05-26 flower

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