The most common and most likely answer to this crossword clue is the 9 letter word TOMBSTONE
I've seen this crossword clue in The Daily Telegraph
T
O
M
B
S
T
O
N
E
More clues leading to the result TOMBSTONE
- Grave scene of western battle
- Monumental output of Arizona film location?
- Western US city most bet on to be redeveloped
- Trombones will be played as Queen leaves after time in memorial
- Unruly mob sent to film location
- Last monument in Arizona?
- Bottom’s bust — direction to jump from a cliff
- . It carries a grave message
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 TOMBSTONE mean?
TOMBSTONE noun- A headstone marking a person's grave.
- The symbol "∎" marking the end of a proof.
- A marker that takes the place of deleted data, allowing for replication of the deletion across servers etc.
- A crashdump.
- An unusual morphological feature on an electrocardiogram indicative of acute myocardial infarction, characterized by a massive ST elevation.
- To take part in tombstoning: to jump into the sea, etc. from a cliff or other high point so as to enter the water vertically straight.
- For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface.
- To replace (an object or data) with a tombstone marker.