Crossword Genius

Heartless diver's negligence leads to a parting of ways (10)

Ross

I believe the answer is:

divergence

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'ways' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for divergence that I've seen before include "departure" , "A moving apart" , "being different" .)

I've seen this clue in the Sydney Morning Herald.
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