Some Swede is taunting a believer (5)
I believe the answer is:
deist
'believer' is the definition.
(person who believes in a god)
'some swede is taunting a' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'DEIST' can be found hidden inside 'swede is taunting a'.
(Other definitions for deist that I've seen before include "Believer in the existence of god" , "Religious believer" , "One who believes" , "I believe" , "Sort of believer" .)