Here's another way to look at it (and further muddy the waters
), if it has a spring in it, designed to push the ammo out (for feeding) its a magazine.
If it has or is a spring (many clips are spring steel) intended to keep the ammo in it (until the shooter or the gun strips it out), its a clip.
Stripper clips hold rounds in a line, until the shooter strips them out, into a magazine (either the built in one of the gun, or the detatchable kind).
Moon and half-moon clips (used in some revolvers) hold the rounds together, go in the gun together, and come out of the gun still all together.
The Enbloc system, used in the M1 Garand rifle uses a spring steel clip, holding a "bloc" of 8 rounds. The whole thing goes in the rifle, and when the last round is fired, the empty clip is ejected. A couple of European bolt action rifles also used this idea, differing primarily in the clips held 5 rounds in a line, and dropped out of the bottom of the gun when empty.
To REALLY confuse the issue, some gunmakers have called their magazines "clips", so that people who didn't know they should be looking for magazines, not clips, could still locate and buy them. Not common, but has been done.