Crossword Genius

Finally picking up note amidst a lot of notes (2,3)

Ross

I believe the answer is:

in sum

'finally' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for in sum that I've seen before include "to put it briefly" , "In short" , "All things considered" .)

I've seen this clue in The Independent.
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