Dreadlocks wearer (5)
(Other definitions for watts that I've seen before include "Rolling Stones drummer?" , "Power units (lighting)" , "G. F. -, Eng. artist; power units" , "Sculptor" , "rates of working" .)
'dreadlocks wearer' 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 "A certain believer" , "Jamaican believer" , "Follower of Rastafarianism" , "Black man" , "One following religion" .)