Prophet using common sense about crazy paintings surrealist initially put up (11)

I believe the answer is:

nostradamus

I'm a little stuck... Click here to teach me more about this clue!

'prophet' is the definition.
(French astrologer and supposed prophet)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nostradamus that I've seen before include "He predicted" , "visionary legend" , "French sixteenth century astrologer" , "obscure old versifier" , "Old astrologer" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.