Siddhartha Gautama (6)
I believe the answer is:
buddha
'siddhartha gautama' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for buddha that I've seen before include "One who has achieved a state of perfect enlightenment" , "statue in temple" , "Founder of eastern religion circa 500 BC" , "Gautama . . . . . ., founder of eastern religion" , "Fifth-century BC founder of an Asian religious philosophy" .)