A cashel is a stone-walled ringfort, the type of enclosed farmstead that early medieval Irish families built from roughly the fifth century onwards to protect their households and livestock. Clare is unusually dense with them, the Burren alone being scattered with hundreds, but Cahermacrea's example remains one of those sites whose formal record has yet to catch up with its physical presence on the ground.

The name Cahermacrea is itself suggestive. "Caher" derives from the Irish "cathair", meaning a stone fort, so the townland takes its identity directly from a monument of this kind, a sign that the structure was prominent enough, and old enough, to shape how people named and understood the land around it. Stone ringforts of this type were typically built by farming families of some local standing, enclosing a round or oval area with a substantial dry-stone wall. They were not primarily military structures but working settlements, and their survival in Clare owes much to the rocky terrain that made dismantling them for other building materials less worthwhile than it might have been elsewhere in Ireland.