The most common and most likely answer to this crossword clue is the 11 letter word DISCONTINUE
I've seen this crossword clue in Financial Times
D
I
S
C
O
N
T
I
N
U
E
Buddy explains!
The straight part
We know that "Stop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stop = discontinue.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 DISCONTINUE mean?
DISCONTINUE verb- To interrupt the continuance of; to put an end to, especially as regards commercial productions; to stop producing, making, or supplying something.