The central rectangular area, measuring 44 metres northeast to southwest and 36 metres northwest to southeast, is now covered in grass and scrub. Earthen banks ranging from 4 to 7 metres wide and standing 0.8 to 1.1 metres high define three sides of this enclosure, whilst the southeastern side remains open. A complete moat surrounds the site; though now flat-bottomed and overgrown, it still measures 5 to 6.5 metres wide and drops 1.4 to 1.7 metres below the interior ground level.

Beyond this inner defensive system lies an even more substantial outer fortification. An external bank, measuring 4 to 6 metres wide and rising 1.3 to 2.2 metres high, encircles all but the southeastern approach. This outer bank is accompanied by an external fosse, or defensive ditch, which at its southwestern section spans 6 metres wide and reaches a depth of 1 metre. The entire complex, including these outer defences, extends to maximum dimensions of 68 metres northeast to southwest and 54 metres northwest to southeast.

First documented by Barry in 1977 and later included in the Archaeological Inventory of County Wexford published in 1996, this moated site at Clonee Upper represents a type of fortified settlement that was particularly common in medieval Ireland. These sites, typically dating from the 13th to 14th centuries, were often constructed by Anglo-Norman settlers as defended farmsteads or minor manor houses, combining residential and agricultural functions with defensive capabilities suited to the uncertain times.