I thought it was:
Clip = retains ammo as a unit to be feed into weapon. Does not fully enclose ammo.
ie stripper clip
Magazine = encloses ammo and feeds ammo to action, often detachable.
the Garand 8 Round clip doesn't simply load the ammo into the gun's magazine. It also functions to feed the action?
Very interesting.
Garand clips, like Mannlicher clips, are "en bloc" clips, and stay in the magazine until empty, functioning in the same way as the "lips" of a detachable magazine.