Take action against this woman (3)
I believe the answer is:
sue
This clue is a double definition.
'take action against' is the first definition.
(I've seen this before)
'this woman' is the second definition.
(Other definitions for sue that I've seen before include "Take legal case against" , "Use to take to court" , "Make a case against" , "Susan (dim.)" , "Bring charges against - girl" .)