What presumably inspired UKIP with right to destroy Britain's sense of well-being? (8)
I believe the answer is:
euphoria
'well-being?' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for euphoria that I've seen before include "Intense happiness and elation" , "Delight" , "In high spirits" , "Feeling of extreme elation" , "Feeling of general happiness" .)