The most common and most likely answer to this crossword clue is the 7 letter word CHORTLE
I've seen this crossword clue in Financial Times
C
H
O
R
T
L
E
More clues leading to the result CHORTLE
- Retiring officer engaged in boring work? What a laugh!
- Laugh when officer turns up, interrupting task
- Laugh with little time left in tedious job
- Time left to be engaged in task? What a laugh!
- Renovated Chevrolet, ‘less English version’: that’s a laugh
- Time learner’s invested in task? It’s a laugh
- Boring work interrupted by extremely tuneful laugh
- Treat hero with tender loving care? That’s a laugh
- … laugh about direction taken by pocket
- Her colt needs breaking. That’s a laugh!
Buddy explains!

The straight part
We know that "a laugh" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a laugh = chortle.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 CHORTLE mean?
CHORTLE noun- A joyful, somewhat muffled laugh, rather like a snorting chuckle.
- A similar sounding vocalisation of various birds.
- To laugh with a chortle or chortles.