Shown on the OS as a “fort”, but described by Coflein as a defended enclosure:
A complex enclosure, about 154m north-south by 94m, set on a west facing slope, defined on the west, and sub-divided internally by a series of north-south cliff-lines, resulting in two distinct enclosures, both are defined by simple banks, doubled about the southern end of the eastern, upper enclosure, each having north-facing entrances.
coflein.gov.uk/en/site/306854/details/CRAIG+ADWY+WYNT%2C+ENCLOSURE/