The most common and most likely answer to this crossword clue is the 9 letter word SWEARWORD
I've seen this crossword clue in The Times
S
W
E
A
R
W
O
R
D
More clues leading to the result SWEARWORD
- Something edgy about sport bringing bit of bad language
- Damage through use breaking blade? Curse!
- Foil covering display of bad language
- 30 perhaps put on, weapon outside
- Something foul made palatable with sugar?
- Curse deterioration in a weapon
- Degeneration involved in endlessly wanting to sleep around! It’s considered offensive
- Curse blade bearing damage from use
- Two promises and an oath
Buddy explains!

The straight part
We know that "Curse" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case curse = swearword.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 SWEARWORD mean?
SWEARWORD noun- A word considered taboo and impolite or offensive.