Going down on one’s genealogical chart (7)
I believe the answer is:
descent
'going down' is the definition.
(process of descending)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for descent that I've seen before include "Fall" , "Pedigree" , "Downward path" , "Bloodline" , "Drop" .)