The most common and most likely answer to this crossword clue is the 11 letter word BOTHERATION
I've seen this crossword clue in The Guardian
B
O
T
H
E
R
A
T
I
O
N
More clues leading to the result BOTHERATION
Buddy explains!
The straight part
We know that "Damn" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case damn = botheration.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 BOTHERATION mean?
BOTHERATION noun- The act of bothering, or state of being bothered; cause of trouble
- An expression of annoyance.