Worshiper of the rain god Tlaloc (5)
I believe the answer is:
aztec
'worshiper of the rain god tlaloc' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aztec that I've seen before include "Pre-Spanish Mexican" , "Old Mexican empire" , "One of Montezuma's people" , "Such as Moctezuma" , "Conquered Mexican" .)