The most common and most likely answer to this crossword clue is the 3 plus 4 plus 4 letter word BAD HAIR DAYS
I've seen this crossword clue in Independent
B
A
D
H
A
I
R
D
A
Y
S
More clues leading to the result BAD HAIR DAYS
Buddy explains!
The straight part
We know that "Times when it all goes wrong" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case times when it all goes wrong = bad hair days.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.