The most common and most likely answer to this crossword clue is the 5 letter word CREED
I've seen this crossword clue in The Times
C
R
E
E
D
More clues leading to the result CREED
- Beliefs of the uninitiated prolonged speech
- Native American daughter making statement of faith
- Set of beliefs about marsh plant
- Faith in mediocre education
- Key underpinning native American belief system
- Animal will get caught retreating – that’s what one believes
- Doctrine of director associated with G Greene
- Belief in team lacking weight with editor
- American Indian daughter’s faith
- Daughter following Native American system of belief
Buddy explains!

The straight part
We know that "Faith" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case faith = creed.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 CREED mean?
CREED noun- That which is believed; accepted doctrine, especially religious doctrine; a particular set of beliefs; any summary of principles or opinions professed or adhered to.
- (specifically) A reading or statement of belief that summarizes the faith it represents; a confession of faith for public use, especially one which is brief and comprehensive.
- The fact of believing; belief, faith.
- (only survives in "creeded") To believe; to credit.
- To provide with a creed.