The most common and most likely answer to this crossword clue is the 5 letter word DENIS
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More clues leading to the result DENIS
Buddy explains!
The straight part
We know that "one French saint" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one french saint = denis.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 DENIS mean?
DENIS noun- A subdivision of currency, equal to 0.01 Macedonian denar.