The most common and most likely answer to this crossword clue is the 7 letter word CRUMBLE
I've seen this crossword clue in The Times
C
R
U
M
B
L
E
More clues leading to the result CRUMBLE
- Fall apart, having cold and noise in stomach?
- Caught noise from empty tummy finding pudding
- Break up gang fight behind clubs
- Fall apart when tummy noise follows onset of colic
- Fall apart, observing corgi’s first growl!
- About to uncover deceit and fall apart
- Put a small piece of something on top of the French pudding
- End of sonic boom’s decay
- Break up street fight after start of carnival
- Conservative brawl leading to break up
Buddy explains!

The straight part
We know that "Fall apart" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fall apart = crumble.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 CRUMBLE mean?
CRUMBLE noun- A dessert of British origin containing stewed fruit topped with a crumbly mixture of fat, flour, and sugar.
- To fall apart; to disintegrate.
- To break into crumbs.
- To mix (ingredients such as flour and butter) in such a way as to form crumbs.