Article is on time for believer (6)
I believe the answer is:
theist
'for believer' is the definition.
(someone who believes in a god)
'article is on time' is the wordplay.
'article' becomes 'the' (the definite article).
'on' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'the'+'is'+'t'='THEIST'
(Other definitions for theist that I've seen before include "Person in good faith" , "Tithes for believer in God" , "Religious type" , "Believer in god/gods" , "One believes in the existence of a god or gods" .)