Crossword Genius

Worked out the figures about mid-January indeed! (7)

Ross

I believe the answer is:

deduced

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'worked out' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for deduced that I've seen before include "Arrived at by reasoning" , "Concluded" , "Inferred" , "Worked out by reasoning" , "Gathered" .)

I've seen this clue in the Evening Standard.
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