The most common and most likely answer to this crossword clue is the 8 letter word BENEDICT
I've seen this crossword clue in The Daily Telegraph
B
E
N
E
D
I
C
T
More clues leading to the result BENEDICT
- Pope wanting English police backup in criminal case
- Saint in debt, early Christian leaders frantic
- Man at the head of order
- First name for Arnold‘s proclamation on Scottish peak
- He pontificates in proclamation following summit
- Saint Arnold, for example
- Monk who founded a monastery order at foot of Scottish mountain
- . Dish for newly married man
Buddy explains!

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