City wife fit for action (7)
I believe the answer is:
lawsuit
'action' is the definition.
('lawsuit' can be a synonym of 'action')
'city wife fit' is the wordplay.
'city' becomes 'la' (Los Angeles).
'wife' becomes 'w'.
'fit' becomes 'suit' ('suit' can be a synonym of 'fit'**).
'la'+'w'+'suit'='LAWSUIT'
'for' acts as a link.
(Other definitions for lawsuit that I've seen before include "Court case" , "Legal proceedings" , "Dispute brought to court" , "Process of bringing dispute or claim before the courts" , "Legal case" .)