Unexpected outcome of dance (5)
I believe the answer is:
twist
This clue is a double definition.
'unexpected outcome' is the first definition.
(as in a twist in a book)
'dance' is the second definition.
(type of dance)
'of' is the link.
(Other definitions for twist that I've seen before include "workhouse child" , "One who asked for more" , "Tobacco - fraud - unexpected development - dance" , "Deal card face upwards" , "Writhe" .)