Member of a Jamaican religion, for short (5)
I believe the answer is:
rasta
'member of a jamaican religion for short' 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 "Jamaican cult member" , "Dreadlocked follower of Haile Selassie" , "Black man" , "Sectarian of Jamaican origin (colloq.)" , "West Indian cult member" .)