Originally Posted by
FlightDetent
Yes from me. Dare the ATC issue an instruction like that - cannot see why not - that's what they would get.
Cleared for the approach, altitude wise, is a clearance all the way to the runway elevation and (at the same time) G/A altitude.
No reference.
Careful with the specifics. While still on vectors and not yet intercepted a leg of the approach, you're not on anything "published" and cannot descend.