What does the cryptic crossword clue "Professor on board joined dive (7)" mean?

The definition is "dive". The wordplay uses a charade (building blocks). PLUM (synonym="Professor Plum, from the board game Cluedo") + MET (synonym="joined") = PLUMMET; definition: "dive" The answer is PLUMMET.

Professor on board joined dive (7)

Guardian Cryptic #29180 | 5 Across | 2023-09-20 flower

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