The most common and most likely answer to this crossword clue is the 6 letter word DENTED
D
E
N
T
E
D
More clues leading to the result DENTED
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 = dented.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 DENTED mean?
DENTED verb- To impact something, producing a dent.
- To develop a dent or dents.