This site is another bit of an oddity as it doesn’t appear on the 1:50000 series OS maps (Pink Cover) but does on the 1:25000 (Orange Cover).
It lies about 5.5km north of Avebury itself and is, undoubtedly, the remains of a substantial stone circle.
I counted three stones in a southern arc with one opposite in the remains of a northern one.
I’m also sure that there is an entrance avenue leading away from this stone away to the field entrance in the gap between the trees.