A cashel is a ringfort defined by a stone wall rather than an earthen bank and ditch, and this example measures approximately 27 metres north to south and 26 metres east to west, with a wall some 2.4 metres wide still standing to a height of 1.1 metres on its outer face. That eastern stretch of wall is the best preserved, and at its centre a faced and splayed entrance, wider on the outside than the inside, opens inward. An upright pillar still stands in the entrance passage, a detail easy to walk past without registering what it might once have meant for the people who passed through it.

The southern wall carries further evidence of how the enclosure was actually used. A thickening at its western end appears to have been built deliberately to accommodate a rectangular hut site tucked against the interior face, while a second, semicircular hut site abuts the centre of that same wall. These structural additions suggest a place adapted and re-adapted over time, which fits with its setting inside a multiperiod field system, a landscape where different generations have left overlapping traces of agriculture and habitation. The cashel was recorded on the 1916 edition of the Ordnance Survey six-inch map, though it was classified only as an "Enclosure" as recently as 1996. Roughly 90 metres to the north-north-west, a second cashel occupies the same elevated pasture, making Gragan a small but notable concentration of early medieval stonework on the Clare landscape.