Cryptic crossword clue
Expressions of disapproval must be a mistake 6

The most common and most likely answer to this crossword clue is the 6 letter word BOOBOO

I've seen this crossword clue in The Daily Telegraph
B
O
O
B
O
O


Buddy explains!

The straight part
We know that "a mistake" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a mistake = booboo.
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 BOOBOO mean?

BOOBOO noun
  1. A mistake or error.
  2. (by or to young children) A minor injury, such as a cut or a bruise.
  3. (by or to young children) Feces.

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