The most common and most likely answer to this crossword clue is the 9 letter word METHODIST
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More clues leading to the result METHODIST
- Matched husband with poet, a religious type
- Princess entertained by the most peculiar church member
- Way it’s converted church member
- Religious follower encountered lots of people around day one
- The most I’d drunk as one who used never to drink!
- Christian’s first technique has precedence
- Approach first man of faith
- Believer is fickle — do test him
- Churchgoer’s spirits at last excellent after taking in cricket match
- Protestant drug poet
Buddy explains!

The straight part
We know that "Believer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case believer = methodist.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does METHODIST mean?
METHODIST noun- One who follows a method.