The most common and most likely answer to this crossword clue is the 3 letter word ADO
A
D
O
More clues leading to the result ADO
- Bother sandboy, now and then
- Trouble? A spot, not tons
- Head of ambassadorial party making trouble
- Bother leader of anarchist party
- Difficulty of a year that never was
- Fuss woodman regularly raised
- A party creating a fuss
- Bustling activity in meadow
- Leader of advance party in trouble.
- Trouble ahead over harbours
Buddy explains!

The straight part
We know that "Bustling activity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bustling activity = ado.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 ADO mean?
ADO noun- Trouble; troublesome business; fuss, commotion