The most common and most likely answer to this crossword clue is the 9 letter word EXECRATED
E
X
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C
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A
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D
Buddy explains!

The straight part
We know that "Damned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case damned = execrated.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 EXECRATED mean?
EXECRATED verb- To feel loathing for; to abhor
- To declare to be hateful or abhorrent; to denounce
- To invoke a curse; to curse or swear