Crossword Genius

Going down on one’s genealogical chart (7)

Ross

I believe the answer is:

descent

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'going down' is the definition.
(process of descending)

I cannot understand how the rest of the clue works.

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(Other definitions for descent that I've seen before include "Fall" , "Pedigree" , "Downward path" , "Bloodline" , "Drop" .)

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