The most common and most likely answer to this crossword clue is the 9 letter word TORPEDOED
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More clues leading to the result TORPEDOED
Buddy explains!

The straight part
We know that "damaged" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case damaged = torpedoed.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 TORPEDOED mean?
TORPEDOED verb- To send a torpedo, usually from a submarine, that explodes below the waterline of the target ship.
- To sink a ship with one of more torpedoes.
- To undermine or destroy any endeavor with a stealthy, powerful attack.