To find the circle head out along the track from the Hurlers carpark. When it forks, take the left one out towards Golddiggings Quarry. About half way along, as the track starts to bend right there seems to be a barrow/mound ? on your left. From here leave the track and head off towards the low tor towards the SW. Bearing slightly left of a line between the tor and the Cheesewring behind you you will somehow find the circle, it has a gorse bush in the middle of it..but there are several bushes!
Better still buy a map.