The most common and most likely answer to this crossword clue is the 3 letter word BOO
I've seen this crossword clue in Financial Times
B
O
O
More clues leading to the result BOO
- Expression of dissent forbidden? No thanks!
- Frightening word that's repeated in error
- Reserve volume endlessly in error
- I don’t like that black pair of spectacles
- Surprising outburst, a little lacking in volume?
- Voice criticism of short volume
- Show disapproval of unfinished literary work
- Report male going to express disapproval
- I don’t like three-quarters of novel
- Short work of literature? I don’t like it!
Buddy explains!
The straight part
We know that "Show disapproval" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case show disapproval = boo.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 BOO mean?
BOO noun- A derisive shout made to indicate disapproval.
- To shout extended boos derisively.
- To shout extended boos at, as a form of derision.
- A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.
- Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly.
- An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred.
- A close acquaintance or significant other.
- Cannabis.