One who achieved a state of perfect enlightenment, d. c.483 BC (6)

I believe the answer is:

buddha

(Other definitions for buddha that I've seen before include "Siddhartha Gautama's title" , "religious effigy" , "Holy man of Indian religion" , "Fifth-century BC founder of an Asian religious philosophy" , "Person who has achieved perfect enlightenment" .)

I've seen this clue in The Guardian.

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