Crossword Genius

Summing up saying something further (6)

Ross

I believe the answer is:

adding

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'summing' is the definition.
('add' can be a synonym of 'sum')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for adding that I've seen before include "Totalling" , "Contributing" , "Totting" , "increasing it by" , "Appending" .)

I've seen this clue in The Globe and Mail.
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