The most common and most likely answer to this crossword clue is the 6 letter word EXCEPT
I've seen this crossword clue in The Daily Telegraph
E
X
C
E
P
T
More clues leading to the result EXCEPT
- Omit former church associated with physical training
- Runs out of passage in bar
- Save end of finger removed from passage
- Content to leave Essex cabbie with pint in bar
- Omit passage trashing Republican
- Bar old church training
- Save piece of text right for deletion
- Save Queen removed from passage
- Part of book that wants reading, maybe, in bar
- … but old mate in Communist Party chose last time
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 = except.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 EXCEPT mean?
EXCEPT verb- To exclude; to specify as being an exception.
- To take exception, to object (to or against).
- With the exception of; but.
- With the exception (that); used to introduce a clause, phrase or adverb forming an exception or qualification to something previously stated.
- Unless; used to introduce a hypothetical case in which an exception may exist.