The most common and most likely answer to this crossword clue is the 8 letter word DEVOURED
I've seen this crossword clue in The Daily Telegraph
D
E
V
O
U
R
E
D
Buddy explains!

The straight part
We know that "destroyed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case destroyed = devoured.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 DEVOURED mean?
DEVOURED verb- To eat quickly, greedily, hungrily, or ravenously.
- To rapidly destroy, engulf, or lay waste.
- To take in avidly with the intellect or with one's gaze.
- To absorb or engross the mind fully, especially in a destructive manner.