The most common and most likely answer to this crossword clue is the 9 letter word UNSTOPPED
I've seen this crossword clue in Financial Times
U
N
S
T
O
P
P
E
D
Buddy explains!
The straight part
We know that "Opened a bottle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opened a bottle = unstopped.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 UNSTOPPED mean?
UNSTOPPED verb- To remove a stoppage; to clear a blockage.
- To unplug or uncork a container.
- To draw out the stops of (an organ).
- Not having been stopped.