Crossword Genius

Person thought to know a lot about a lot (6)

Ross

I believe the answer is:

oracle

(Other definitions for oracle that I've seen before include "Infallible authority" , "Person regarded as source of knowledge, like old Greek prophet" , "Authoritative statement" , "Place where ancient Greeks consulted gods, as at Delphi" , "She prophesised" .)

I've seen this clue in The Guardian.
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