One in dreadlocks (5)
I believe the answer is:
rasta
'one in dreadlocks' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rasta that I've seen before include "Jamaican cult follower (informally)" , "Believer with dreadlocks" , "worshipper of Haile Selassie" , "A certain believer" , "Jamaican cultist" .)