Take back “misfortune” (7)
I believe the answer is:
reverse
I believe this clue is a double definition.
'take back' is the first definition.
(thesaurus)
'misfortune' is the second definition.
(a reversal of fortunes)
(Other definitions for reverse that I've seen before include "Turn inside out or upside down" , "Transpose" , "Invert" , "One side of a coin" , "Defeat - setback - other side" .)