Worshiper of Jah, informally (5)
I believe the answer is:
rasta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">worshiper of jah informally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rasta that I've seen before include "sectarian worshipper" , "Often a Jamaican" , "Disciple" , "religious follower" , "One following religion" .)