The most common and most likely answer to this crossword clue is the 5 letter word DOGMA
D
O
G
M
A
More clues leading to the result DOGMA
- Boxer maybe supported by mother’s belief
- Belief one may be a source of litter?
- Follow only half of Marx’s doctrine
- Teaching honour awarded to setter, quite possibly?
- Blind faith seen in one having puppies?
- Influential person upset by graduate’s opinions
- Closely follow mother’s principles
- Go mad formulating principle
- Trouble with graduate's blind faith?
- Firm belief in man's best friend, mother
Buddy explains!

The straight part
We know that "thing that people believe in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thing that people believe in = dogma.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 DOGMA mean?
DOGMA noun- An authoritative principle, belief or statement of opinion, especially one considered to be absolutely true and indisputable, regardless of evidence or without evidence to support it.
- A doctrine (or set of doctrines) relating to matters such as morality and faith, set forth authoritatively by a religious organization or leader.