Obtained the right number, indeed (7)

I believe the answer is:

derived

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'obtained' is the definition.
(deriving is a kind of obtaining)

I can't explain the remainder of the clue.

(Other definitions for derived that I've seen before include "Inferred" , "Traced the source" , "Formed or developed from something else" , "Procured" , "Obtained/drawn (from)" .)

I've seen this clue in the Evening Standard.

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