Tea with austere minister (8)
I believe the answer is:
chaplain
'minister' is the definition.
(I've seen this before)
'tea with austere' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'with' is a charade indicator (letters next to each other).
'austere' becomes 'plain' (similar in meaning).
'cha'+'plain'='CHAPLAIN'
(Other definitions for chaplain that I've seen before include "Clergyman attached to an institution, such as the army" , "Member of the clergy attached to an institution" , "Clergyman attached to an organisation" , "cleric" , "Clergyman attached to military unit" .)