Proceedings in a court over one charged (6)
I believe the answer is:
Here is my best explanation:
'proceedings' is the definition.
(action is a kind of proceedings)
'a court over one charged' is the subsidiary indication.
'court' becomes 'ct'.
'over' is a charade indicator (letters next to each other).
'one charged' becomes 'ion' (I've seen this in other clues).
'in' is the link.
(Other definitions for action that I've seen before include "Take proceedings", "Performance", "Accomplishment", "Lawsuit; armed conflict", "court case", "SECOND PART OF 15", "Not CIA (anag)", "The process of doing something", "claim in court" and "Court case".)