Old comic features a bishop's junior colleague? (8)
I believe the answer is:
chaplain
'bishop's junior colleague?' is the definition.
(chaplain is a type of clergyman)
'old comic features a' is the wordplay.
'old comic' becomes 'chaplin' (comic actor Charlie Chaplin).
'features' indicates putting letters inside.
'chaplin' placed around 'a' is 'CHAPLAIN'.
(Other definitions for chaplain that I've seen before include "Clergyman attached to an organisation" , "Armed services clergyman" , "Clergyman attached to military unit" , "Clergyman attached to an institution, such as the army" , "Religious minister assigned to an organisation" .)