Jamaican sectarian (5)
I believe the answer is:
rasta
'jamaican sectarian' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rasta that I've seen before include "Member of WI religion" , "Dreadlocked person (abbr.)" , "Jamaican cult member" , "Bob Marley, for one" , "Jamaican cult follower (informally)" .)