The most common and most likely answer to this crossword clue is the 9 letter word EBULLIENT
I've seen this crossword clue in The Daily Telegraph
E
B
U
L
L
I
E
N
T
More clues leading to the result EBULLIENT
- Exuberant cows briefly entering hospital department
- High-spirited cows briefly invading hospital department
- Papal edict sent electronically that is not bright and breezy?
- Very enthusiastic e-bulletin put out
- Thrown out, but Nellie irrepressible
- Exuberant testament written by endless online trolls?
- Hector heard entering English hospital department full of enthusiasm
- Bubbly English male that’s not without love
- Sparkling Blue Nile flowing by Tana originally
- Gold that is found in surgical department makes one exuberant
Buddy explains!

The straight part
We know that "Bubbly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bubbly = ebullient.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 EBULLIENT mean?
EBULLIENT adjective- Enthusiastic; high-spirited.
- (of a liquid) Boiling or agitated as if boiling.