This clock portrays Mickey and Minnie in a scene from their (truly) first cartoon: Plane Crazy.
I believe this clock came from the Disney Channel, but am not 100% sure. Back in the early 90’s, the Disney Channel was a pay channel. If I recall correctly, it was $10 a month, and worth every penny. It actually played Disney movies, and old cartoons, as well as shows such as “The Swamp Fox”, “The Scarecrow of Romney Marsh”, and “Zorro”.
Every month you would get a channel listing guide, with articles and a little catalog section. This clock may have been ordered from that.
To see another Disney-themed alarm clock, check out the post entitled Black Mickey Mouse Alarm Clock.