Can pilots fly circling approaches at non-towered airports?
The way I understand that ATC order is that it is about "circling approach instructions" which is different than "(circling) approach clearance". They cannot tell you to enter a left downwind, do a right 360, or follow some other specific path to the runway. If they clear you to execute a circling approach to a given runway at a non-towered airport, then the path to the runway is for the pilot to determine, as necessary to separate yourself from other aircraft in the terminal area and land safely.