Crossword Genius

__ machine (6)

Ross

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3 5

6

7 9

'machine' is the definition.
(adding machine is a kind of machine)

This is all the clue.

(Other definitions for adding that I've seen before include "increasing it by" , "Calculating the sum of" , "Putting in" , "Appending" , "Finding the sum" .)

I've seen this clue in the LA Times.
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