Learner's definition of NEAT
1 : not messy: clean and orderly
He keeps his apartment neat and clean.
The store is always busy but they manage to keep the shelves stocked and neat.
a nice neat pile of magazines
Try to be a little neater [=try not to make such a mess] the next time you bake cookies.
Fold the paper to make a neat edge.
2 : liking to keep things very clean and orderly 3 a : simple and clever
b US, informal : pleasant, fun, or interesting
a neat trick
He's got a neat way of memorizing information.
There is, unfortunately, no neat solution to the problem.
4 of alcoholic drinks : not mixed with anything: made without ice or water added