Crossword Genius

Core (6)

Ross

(Other definitions for source that I've seen before include "Spring, fountain head" , "From which something springs" , "Origin; head of stream" , "Origin or starting point" , "'Origin, root (6)'" .)

I've seen this clue in The Guardian, the Penny Press, The Sun, The Telegraph, the Newsday, the Evening Standard and The Mirror.
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