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Scientist, foremost among best of historical researchers (4)

Ross

I believe the answer is:

bohr

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

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

Can you help me to learn more?

(Other definitions for bohr that I've seen before include "Niels -, Danish Nobel physicist" , "Danish Nobel-winning physicist (father or son)" , "scientist" .)

I've seen this clue in The Independent.
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