What does the cryptic crossword clue "Extended treatise penned by professional wordsmith (10)" mean?

The definition is "Extended". The wordplay uses a charade (building blocks). PRO (synonym="‘professional’") + TRACT (synonym="‘treatise’") + ED (synonym="‘wordsmith’ – a change from journalist or the like") = PROTRACTED; definition: "Extended" The answer is PROTRACTED.

Extended treatise penned by professional wordsmith (10)

Guardian Cryptic #29035 | 18 Across | 2023-04-04 flower

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