The most common and most likely answer to this crossword clue is the 5 letter word DEBAR
I've seen this crossword clue in The Daily Telegraph
D
E
B
A
R
More clues leading to the result DEBAR
- R&A plot to overturn ban
- Exclude bachelor that's in love
- Exclude being served by rude baristas
- Book suppressed by costly ban
- Exclude from French drinking place
- Accessing honey, bee say is shut out
- Pet bites bishop so gets shut out
- Exclude use of foreign lawyers
- Stop sweetheart embracing bachelor
- Don’t allow untidy beard
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 = debar.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 DEBAR mean?
DEBAR verb- To exclude or shut out; to bar.
- To hinder or prevent.
- To prohibit (a person or company that has been convicted of criminal acts in connection with a government program) from future participation in that program.