The most common and most likely answer to this crossword clue is the 3 letter word HOO
I've seen this crossword clue in The Daily Telegraph
H
O
O
More clues leading to the result HOO
- Bard’s rollicking outburst, not enough for forest outlaw
- Cries of surprise rising in commotion
- Illicit drink about to be removed, leading to a kerfuffle
- Hotels keeping ducks — a great deal of fuss
- Article supporting back-to-back housing causing fuss
- Uproar with cries of excitement, one way or the other?
- Fuss, making rounds between hospitals over area
- Goalless draw between Hearts and Hibs starting a fuss
- Hotels accommodate ducks with a tremendous fuss
- Expressions of surprise raised a fuss
Buddy explains!

The straight part
We know that "Fuss" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fuss = hoo.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.