Cryptic crossword clue
Saying from the Bible on making a mistake 8

The most common and most likely answer to this crossword clue is the 8 letter word AVERRING

I've seen this crossword clue in The Daily Telegraph
A
V
E
R
R
I
N
G

Buddy explains!

The straight part
We know that "Saying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case saying = averring.
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 AVERRING mean?

AVERRING verb
  1. To assert the truth of, to affirm with confidence; to declare in a positive manner.
  2. To prove or justify a plea.
  3. To avouch, prove, or verify; to offer to verify.

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