The most common and most likely answer to this crossword clue is the 10 letter word APOCALYPSE
I've seen this crossword clue in The Times
A
P
O
C
A
L
Y
P
S
E
More clues leading to the result APOCALYPSE
- Dance, lifting bottom in mock revelation
- Dance back to front? Take off clothes in the end
- Song mostly probing a writer’s devastation
- A US writer penning song, not entirely a disaster
- Short ballad a mysterious writer pens is revelation
- Revelation from a policeman must turn up before evidence ultimately plays out
- Copy includes song back to front – a major disaster
- Imitate round dance, finally leads to disaster
- Shortened song penned by a US writer is the last item
- The end, easy? Coppola’s upset to lose Oscar
Buddy explains!

The straight part
We know that "the end" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the end = apocalypse.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 APOCALYPSE mean?
APOCALYPSE noun- A revelation.
- The unveiling of events prophesied in the Revelation; the second coming and the end of life on Earth; global destruction.
- The Book of Revelation.
- A disaster; a cataclysmic event.