Crossword Genius

Professor on board with Eccles beginning to take plunge (7)

Ross

I believe the answer is:

plummet

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'plunge' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for plummet that I've seen before include "Fall like a stone" , "fall sharply" , "Fall rapidly" , "Nose-dive" , "Fall at high speed" .)

I've seen this clue in The Independent.
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