The most common and most likely answer to this crossword clue is the 5 letter word ESTOP
I've seen this crossword clue in The Times
E
S
T
O
P
More clues leading to the result ESTOP
- Europeans on vacation head for bar
- Bar work follows lie-down, mid-afternoon out of sight
- Prevent scriptures turning up, in a strange sense
- European trophies put back in bar
- Knock beers back near the rear of the Lawyer’s Bar
- Poets working in bar
- Prevent schemes to plagiarise extract
- Drunk topes in bar
- Is Parisian going to work in bar?
- “Drugs kill” bar
Buddy explains!

The straight part
We know that "bar" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bar = estop.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 ESTOP mean?
ESTOP verb- To impede or bar by estoppel.
- To stop up, to plug