This is a rath, the term used for an earthen ringfort, a type of enclosed farmstead built predominantly during the early medieval period, roughly between the fifth and twelfth centuries, as a combination of homestead and status symbol for farming families.

The enclosure measures around 24 metres across its east-west axis, bounded by an earthen bank that stands roughly 0.8 metres above the interior ground level and about a metre above the exterior. Along parts of its circuit the bank is faced with stone, while elsewhere it remains purely earthen. One section of the bank to the south has been absorbed into the field fence system, a fate common to many such monuments across Ireland as land management quietly swallowed earlier boundaries into its own logic. The interior is partially overgrown with briars and scrub. More intriguing is a rectangular depression in the north-west quadrant, measuring approximately 8 metres by 3 metres and sinking to around 0.6 metres below the surrounding surface. Features like this within ringfort interiors are sometimes associated with souterrains, underground stone-lined passages used for storage or refuge, though the notes do not confirm this interpretation for Clashbredane specifically. What it does suggest is that the interior once held structure and purpose well beyond what is visible at ground level today.