Crossword Genius

Not all auditors can add up (4)

Ross

I believe the answer is:

some

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'not all' is the definition.
(I know this)

I can't explain the remainder of the clue.

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(Other definitions for some that I've seen before include "Hard work" , "Several" , "A little; not a little" , "Undefined number" , "An unspecified quantity, not all" .)

I've seen this clue in the Sydney Morning Herald.
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