The most common and most likely answer to this crossword clue is the 9 letter word SWINGEING
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More clues leading to the result SWINGEING
Buddy explains!

The straight part
We know that "Extreme" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extreme = swingeing.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 SWINGEING mean?
SWINGEING verb- To singe.
- To move like a lash; to lash.
- To strike hard.
- To chastise; to beat.
- Huge, immense.
- Heavy, powerful, scathing.