Part-time judge dealing with injunction catches cold (8)
I believe the answer is:
recorder
'part-time judge' is the definition.
(barrister who acts as a judge part-time)
'dealing with injunction catches cold' is the wordplay.
'dealing with' becomes 're' (regarding).
'injunction' becomes 'order' (I've seen this in another clue).
'catches' means one lot of letters goes inside another.
'cold' becomes 'C' (eg on taps).
're'+'order'='reorder'
'reorder' going around 'c' is 'RECORDER'.
(Other definitions for recorder that I've seen before include "Archivist - part-time judge" , "The one who takes notes and a tubular wind instrument" , "Judge - musical instrument" , "Wind instrument - historian, perhaps" , "Registrar" .)