The most common and most likely answer to this crossword clue is the 9 letter word CANONISED
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More clues leading to the result CANONISED
Buddy explains!

The straight part
We know that "regarded as saint" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case regarded as saint = canonised.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 CANONISED mean?
CANONISED verb- To declare (a deceased person) as a saint, and enter them into the canon of saints.
- To regard as a saint; to glorify, to exalt to the highest honour.
- To formally declare (a piece of religious writing) to be part of the biblical canon.
- (by extension) To regard (an artistic or written work) as one of a group of works representative of a particular field.
- Especially of a church: to give official approval to; to authorize, to sanction.