Most of the "proper" crosswords are still written by people - you can tell from the clues - but a lot of the "cryptic" or "quick" ones aren't: they're built by programs which then select one of the meanings from a dictionary, and use that as a clue.
Download the installer of Cheetah 1.0 for free and take a look at users' reviews on Droid Informer. The app works flawlessly on Android 3.0 and higher. This download is completely secure. Apposite Software is the creator of this application which is included in the Entertainment category.