The most common and most likely answer to this crossword clue is the 9 letter word BATTERING
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Buddy explains!
The straight part
We know that "that’s used to buffet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that’s used to buffet = battering.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 BATTERING mean?
BATTERING verb- To hit or strike violently and repeatedly.
- To coat with batter (the food ingredient).
- To defeat soundly; to thrash.
- (usually in the passive) To intoxicate.
- To flatten (metal) by hammering, so as to compress it inwardly and spread it outwardly.
- To slope (of walls, buildings etc.).
- A heavy beating
- A large defeat