The most common and most likely answer to this crossword clue is the 5 letter word LAITY
I've seen this crossword clue in The Guardian
L
A
I
T
Y
More clues leading to the result LAITY
- Arrange to bring in computers for people
- People taking position about sex
- Neglect to send out Times: they haven’t taken orders
- Ordinary people bet about it
- Ordinary people from Italy, loosely
- Congregational members showing lack of discipline ignoring cross
- Vote to Leave behaving carelessly? They’re no experts
- Song retains appeal for amateurs
- Old song retains appeal for amateurs
- There’s a song about it for amateurs
Buddy explains!

The straight part
We know that "They’re no experts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’re no experts = laity.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 LAITY mean?
LAITY noun- People of a church who are not ordained clergy or clerics.
- The common man or woman.
- The unlearned, untrained or ignorant.