Girl to take legal action (3)
I believe the answer is:
sue
I believe this is a double definition.
'girl' is the first definition.
(girl's name)
'take legal action' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for sue that I've seen before include "Litigious girl" , "Take case against in court" , "Use to take to court" , "Seek legal redress" , "Legally challenge" .)