The most common and most likely answer to this crossword clue is the 9 letter word SYNOPTIST
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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 SYNOPTIST mean?
SYNOPTIST noun- Any of the authors of the three synoptic gospels, which give a history of Jesus Christ's life and ministry, in distinction from the writer of John's Gospel, which gives a fuller record of Christ's teachings.