The most common and most likely answer to this crossword clue is the 7 letter word MALACHI
I've seen this crossword clue in The Daily Telegraph
M
A
L
A
C
H
I
More clues leading to the result MALACHI
- What may be read in a church in the country?
- Prophet establishing a church in part of Africa
- Prophet in endless pain in country
- Hail ‘Cam’, spin-doctored as a prophet
- Book as part of normal achievement
- Prophetic work contributing to optimal achievement
- OT prophet beginning to mutter in the manner of Greek character
Buddy explains!

The straight part
We know that "prophet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case prophet = malachi.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.