Believer in a god (6)

I believe the answer is:

theist

'believer in a god' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for theist that I've seen before include "Believer in a creator god" , "Tithes for believer in God" , "One believes in the existence of a god or gods" , "Believer in god/gods" , "Person in good faith" .)

I've seen this clue in the Thinks.com and The Telegraph.

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