Crossword Genius

Renaissance polymath upsetting old doctor with article on Xmas (8)

Ross

I believe the answer is:

leonardo

'renaissance polymath' is the definition.
(Leonardo da Vinci)

I can't explain the rest of the clue.

(Other definitions for leonardo that I've seen before include "Italian boy" , "US actor, - DiCaprio" , "Da Vinci's name" , "Da Vinci and Di Caprio" , "The Mona Lisa was painted by . . . . . . . . da Vinci" .)

I've seen this clue in The Independent.
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