The most common and most likely answer to this crossword clue is the 7 letter word PIETIES
I've seen this crossword clue in The Guardian
P
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E
T
I
E
S
More clues leading to the result PIETIES
Buddy explains!

The straight part
We know that "Devout beliefs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case devout beliefs = pieties.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 PIETIES mean?
PIETIES noun- Reverence and devotion to God.
- Similar reverence to one's parents and family or to one's country.
- A devout act or thought.
- A belief that is accepted unthinkingly and with undue reverence.