Arabs ban frenzied missionary (8)
I believe the answer is:
barnabas
'missionary' is the definition.
(I've seen this before)
'arabs ban frenzied' is the wordplay.
'frenzied' is an anagram indicator.
'arabs'+'ban'='arabsban'
'arabsban' anagrammed gives 'BARNABAS'.
(Other definitions for barnabas that I've seen before include "saint" , "missionary" , "one spreading the Word" .)