Churchman disturbed clan raid (8)
I believe the answer is:
cardinal
'churchman' is the definition.
(I have seen 'Senior churchman' mean 'cardinal' so perhaps 'churchman' could also mean 'cardinal')
'disturbed clan raid' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'clan'+'raid'='clanraid'
'clanraid' with letters rearranged gives 'CARDINAL'.
(Other definitions for cardinal that I've seen before include "Red American songbird" , "One, perhaps" , "Most important number" , "Counsellor to the Pope" , "of the highest importance" .)