Prophet has new scorn (5)
I believe the answer is:
sneer
'scorn' is the definition.
(I know that Sneer is a type of scorn)
'prophet has new' is the wordplay.
'prophet' becomes 'seer' (both can mean someone who tells the future).
'has' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'seer' enclosing 'n' is 'SNEER'.
(Other definitions for sneer that I've seen before include "sound scornful" , "Speak scornfully" , "Express cynical contempt" , "Contemptuous look" , "Curl one's lip" .)