If I understand you right, you want to spawn an object when you click. Then this:
var splash_scene = preload("drag_your_tscn_scene_from_the bottom_left_window_to_here")
if event is InputEventMouseButton:
var splash = splash_scene.instance()
splash.position = event.position
To delete it when you're done, add a "Call Method Track" to your AnimationPlayer and call a
queue_free method on the last frame.
So you know, this can also be achieved with a shader but that's a little more advanced.