The most common and most likely answer to this crossword clue is the 8 letter word BLINKING
I've seen this crossword clue in The Times
B
L
I
N
K
I
N
G
More clues leading to the result BLINKING
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 = blinking.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 BLINKING mean?
BLINKING verb- To close and reopen both eyes quickly.
- To flash on and off at regular intervals.
- To perform the smallest action that could solicit a response.
- To shut out of sight; to evade; to shirk.
- To trick; to deceive.
- To turn slightly sour, or blinky, as beer, milk, etc.
- To teleport, mostly for short distances.
- The act of something that blinks.
- That blinks.
- Bloody