This can end badly and create disillusionment (10)
I believe the answer is:
disenchant
'create disillusionment' is the definition.
I can't tell whether this defines the answer.
'this can end badly' is the wordplay.
'badly' indicates anagramming the letters.
'this'+'can'+'end'='thiscanend'
'thiscanend' anagrammed gives 'DISENCHANT'.
'and' is the link.
Can you help me to learn more?
(Other definitions for disenchant that I've seen before include "Make someone feel let down" , "open someone's eyes" , "take the magic away" .)