The most common and most likely answer to this crossword clue is the 9 letter word CATACLYSM
C
A
T
A
C
L
Y
S
M
More clues leading to the result CATACLYSM
- Disaster may last centuries, following destruction
- Stay calm, somehow, after pandemic’s ultimate disaster
- Doctor acts calmly after loss of 50 in major disaster
- Disaster unknown amongst various calm acts
- Initially canines stay calm around upheaval
- Calm stay disrupted around college? A disaster
- Pet at Macy’s running with tip of leash causing disaster
- Disaster from lac my acts generated
- Act smartly! Act briefly! Sly man’s planning disaster
Buddy explains!

The straight part
We know that "disaster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disaster = cataclysm.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 CATACLYSM mean?
CATACLYSM noun- A sudden, violent event.
- A sudden and violent change in the earth's crust.
- A great flood.