Crossword Genius

Addition column (4)

Ross

I think it could be either:

ones

tens

'addition column' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ones that I've seen before include "Singletons" , "(Of ship) returning to port of origin" , "Units" , "Individuals" , "1 & 1 & 1" .)

I've seen this clue in the King Feature Syndicate, the LA Times and The Wall Street Journal.
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