The most common and most likely answer to this crossword clue is the 5 letter word BRIEF
I've seen this crossword clue in The Times
B
R
I
E
F
More clues leading to the result BRIEF
- Short fibre spun
- Crisp, cheese flavour, originally
- Cheese fondue's first for barman?
- Lawyer / put in the picture
- Skimpy underpants hiding the bottom
- Orders strong cheese to start with
- Brusque barrister
- Small book, one carried by match official
- Initially quoted coppers for a barrister, perhaps, in this
- Short, strong cheese as starter
Buddy explains!

The straight part
We know that "barman?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case barman? = brief.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 BRIEF mean?
BRIEF noun- A writ summoning one to answer to any action.
- An answer to any action.
- A memorandum of points of fact or of law for use in conducting a case.
- (by extension) A position of interest or advocacy.
- An attorney's legal argument in written form for submission to a court.
- (English law) The material relevant to a case, delivered by a solicitor to the barrister who tries the case.
- A short news story or report.
- (usually in the plural) undershorts briefs.
- A summary, précis or epitome; an abridgement or abstract.
- A letter patent, from proper authority, authorizing a collection or charitable contribution of money in churches, for any public or private purpose.
- (slang) A ticket of any type.
- To summarize a recent development to some person with decision-making power.
- To write a legal argument and submit it to a court.
- Of short duration; happening quickly.
- Concise; taking few words.
- Occupying a small distance, area or spatial extent; short.
- Rife; common; prevalent.
- Briefly.
- Soon; quickly.