The most common and most likely answer to this crossword clue is the 8 letter word HARANGUE
I've seen this crossword clue in The Sunday Telegraph
H
A
R
A
N
G
U
E
More clues leading to the result HARANGUE
- Tirade in Irish islands ultimately scathing in tone
- Hear a gun going off in attack
- Earn a hug, changing angry speech
- Aggressive speech by playwright carrying a fake gun
- Hear a gun going off in lecture
- Dash across part of Scotland, missing last lecture
- Angry speech tore into former Tory leader
- Pompous speech minister has dashed through
- Managed in a huge complex producing slate
- Aggressive speech organised in main part of Dutch city
Buddy explains!

The straight part
We know that "Aggressive speech" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aggressive speech = harangue.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 HARANGUE mean?
HARANGUE noun- An impassioned, disputatious public speech.
- A tirade, harsh scolding or rant, whether spoken or written.
- To give a forceful and lengthy lecture or criticism to someone.