Old star with cane enslaves a minister (8)
I believe the answer is:
chaplain
'minister' is the definition.
(I know that Chaplain is a type of minister)
'old star with cane enslaves a' is the wordplay.
'old star with cane' becomes 'Chaplin' (Charlie Chaplin).
'enslaves' indicates putting letters inside.
'chaplin' enclosing 'a' is 'CHAPLAIN'.
(Other definitions for chaplain that I've seen before include "cleric" , "Member of the clergy, in 24 ac say" , "Army padre" , "Religious minister assigned to an organisation" , "Member of the clergy attached to an institution" .)