Arrange again to incorporate first of cases for part-time judge (8)
I believe the answer is:
Here is my best explanation:
'part-time judge' is the definition.
(I've seen this before)
'arrange again to incorporate first of cases' is the subsidiary indication.
'arrange again' becomes 'reorder' ('order' is an answer for 'arrange' so perhaps 'reorder' is OK for 'arrange again').
'to incorporate' indicates putting letters inside.
'first of cases' becomes 'c' (I can't explain this - if you can you should give a lot more credence to this answer).
'reorder' placed around 'c' is 'recorder'.
'for' is the link.
(Other definitions for recorder that I've seen before include "One taking down notes", "Wind instrument - historian, perhaps", "Musical instrument or note-taker", "Judge; woodwind instrument", "Renaissance flute", "Archivist - part-time judge", "Woodwind instrument; official", "Judge - musical instrument", "found on the bench" and "Instrument of the flute family".)