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Reporter won by taking on top economists individually (3,2,3)

Ross

I believe the answer is:

one by one

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'individually' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for one by one that I've seen before include "Sequentially" , "How queue's served" , "royal autobiography?" , "Eleven" , "separately" .)

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