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.
I cannot really understand how this works, but
'article' could be 'the' (the definite article in English) and 'the' is located in the answer.
'is' is found in the answer.
'time' could be 't' (abbreviation) and 't' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(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" .)