The first sort of believer (6)

I believe the answer is:

theist

'sort of believer' is the definition.

'the first' is the wordplay.
'first' becomes 'ist'.
'the'+'ist'='THEIST'

(Other definitions for theist that I've seen before include "Religious type" , "Person who believes in the existence of a god" , "Believer in the existence fo a god" , "Believer in a creator god" , "Person in good faith" .)

I've seen this clue in The Times.

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