They're saying that if they just acknowledge you, you're pretty much cleared for the approach as expected/standard, but they generally give an instruction, like report at a certain point, or maintain an altitude, as far as I know. At Jandakot they will always reply "your call sign, maintain 1500" so then you are cleared into the airspace but must maintain 1500, until they give you joining instructions and say cleared visual approach. And you need to report at whichever visual reporting point is standard for that approach as shown on your charts. Then you can descend to pattern altitude and join as instructed. A few of the videos on my YouTube channel have a couple of different visual approaches at Jandakot if that helps