i’ve found push jerks to be quite useful for developing the snatch (i’ve come across them called push drops, push unders, drop unders amongst other things)
stand with a bar across your shoulders as if squatting. set hands to snatch width (although try it with a clean-width grip to get the feel of it first). bend the knees into a 1/4 squat, as if about to perform a behind-the-neck push press and then drive the bar up to full arm extension whilst at the same time dropping under the bar into an overhead squat position.
stand up from this overhead squat position to complete the lift.
i’ve found they’re a good progression from the overhead squat (which are usually slow and controlled) to a more dynamic way to practice the catch or receiving position.
hope this helps,
cheers, tom.