Reggae's Peter Tosh, religiously (5)

I believe the answer is:

rasta

(Other definitions for rasta that I've seen before include "Member of WI religion" , "religious follower" , "Dreadlocked follower of Haile Selassie" , "Member of cult worshipping Haile Selassie" , "Member of a religious movement with Jamaican origins" .)

I've seen this clue in the Universal.

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