The most common and most likely answer to this crossword clue is the 7 letter word CASCADE
I've seen this crossword clue in The Daily Telegraph
C
A
S
C
A
D
E
More clues leading to the result CASCADE
- Patient describing rotter's dramatic fall
- Fall of scoundrel involved in case
- Lawsuit involves rotter in dramatic fall
- Situation in which bounder falls
- Rat drowned by situation, series of waterfalls
- Rush to trap rat in container
- Flood when scoundrel punctures canoe on vacation
- Fall of villain in lawsuit
- In investigation bad person falls
- Rogue wearing suit is 21, maybe
Buddy explains!

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 CASCADE mean?
CASCADE noun- A waterfall or series of small waterfalls.
- A stream or sequence of a thing or things occurring as if falling like a cascade.
- A series of electrical (or other types of) components, the output of any one being connected to the input of the next; See also daisy chain
- A pattern typically performed with an odd number of props, where each prop is caught by the opposite hand.
- A sequence of absurd short messages posted to a newsgroup by different authors, each one responding to the most recent message and quoting the entire sequence to that point (with ever-increasing indentation).
- A hairpiece for women consisting of curled locks or a bun attached to a firm base, used to create the illusion of fuller hair.
- A series of reactions in which the product of one becomes a reactant in the next
- To fall as a waterfall or series of small waterfalls.
- To arrange in a stepped series like a waterfall.
- To occur as a causal sequence.
- To vomit.