The most common and most likely answer to this crossword clue is the 9 letter word INVECTIVE
I've seen this crossword clue in The Daily Telegraph
I
N
V
E
C
T
I
V
E
Buddy explains!

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 INVECTIVE mean?
INVECTIVE noun- An expression which inveighs or rails against a person.
- A severe or violent censure or reproach.
- Something spoken or written, intended to cast shame, disgrace, censure, or reproach on another.
- A harsh or reproachful accusation.
- Characterized by invection or railing.