High flyer's evil tour with Satan (9)
I believe the answer is:
astronaut
'high flyer's' is the definition.
'astronaut' can be an answer for 'flyer's' (thesaurus). I am not sure about the 'high' bit.
'evil tour with satan' is the wordplay.
'evil' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'tour' after 'satan' is 'satantour'.
'satantour' with letters rearranged gives 'ASTRONAUT'.
Can you help me to learn more?
(Other definitions for astronaut that I've seen before include "high flier" , "Buzz Aldrin, for example" , "Space explorer" , "Armstrong or Sharman, say" , "High-flyer" .)