The most common and most likely answer to this crossword clue is the 5 letter word LAUGH
I've seen this crossword clue in Independent
L
A
U
G
H
More clues leading to the result LAUGH
- Joke that’s disgusting – beneath the French
- Music to comic’s ears? Note opposite reaction
- Crack up back of gluteal area, you disgust me!
- Scream in US city, repugnant sound
- Hard on the ear without a joke
- Lunatic naughtily suppressing tiny titter
- Scream expression of disgust following the French
- Lord Waugh releases woman, giving a chuckle
- Roar when Australian cricketer loses wicket for fifty
- Fun activity that’s unpleasant after lady gets half-cut
Buddy explains!

The straight part
We know that "Joke" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case joke = laugh.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 LAUGH mean?
LAUGH noun- An expression of mirth particular to the human species; the sound heard in laughing; laughter.
- Something that provokes mirth or scorn.
- A fun person.
- To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.
- To be or appear cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport.
- (followed by "at") To make an object of laughter or ridicule; to make fun of; to deride; to mock.
- To affect or influence by means of laughter or ridicule.
- To express by, or utter with, laughter.