Downfall (7)
'downfall' is the definition.
(both can mean a loss of power or position)
This is all the clue.
(Other definitions for undoing that I've seen before include "Cause of ruin" , "(A person's) ruin or downfall" , "Taking apart" , "Ruin - disaster" .)
'downfall' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for demise that I've seen before include "(Person's) death" , "Death, collapse" , "Passing" , "Death or termination" , "Death or expiration" .)
'downfall' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for overthrow that I've seen before include "Unexpected run" , "Bring extra" , "Dethrone or oust" , "caused discomfiture" , "depose government" .)
(Other definitions for ruination that I've seen before include "Complete downfall" , "Utter destruction" , "End" , "In financial disaster" , "Crippling defeat" .)