What does the cryptic crossword clue "Fourth book nurse composed about doctor (7)" mean?

The definition is "Fourth book". The wordplay uses anagram, charade. anagram of NURSE ("nurse") + MB (abbreviation of "doctor") [anagram: "composed"] = NUMBERS; definition: "Fourth book" The answer is NUMBERS.

Fourth book nurse composed about doctor (7)

Guardian Cryptic #28990 | 17 Across | 2023-02-10 flower

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