Related to a clergy member's completed exam (8)
I believe the answer is:
pastoral
'related to a clergy member's' is the definition.
(relating to a pastor)
'completed exam' is the wordplay.
'completed' becomes 'past'.
'exam' becomes 'oral' (oral exam is a kind of exam).
'past'+'oral'='PASTORAL'
(Other definitions for pastoral that I've seen before include "of a priest" , "Country style" , "Depicting rural life" , "Beethoven's 6th symphony ..." , "Of shepherds or spiritual guides" .)