Churchman in wild 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')
'wild clan raid' is the wordplay.
'wild' is an anagram indicator.
'clan'+'raid'='clanraid'
'clanraid' with letters rearranged gives 'CARDINAL'.
'in' acts as a link.
(Other definitions for cardinal that I've seen before include "Most important number" , "Senior churchman - bird" , "cleric" , "One, perhaps" , "Red - chief - RC dignitary" .)