Souterrains, from the Old French for "underground passage", were typically constructed from dry-stone walling and corbelled or lintelled roofing, then buried beneath the earth. They appear most often in association with ringforts and early settlement sites, and their purpose has been debated at length; cold storage, refuge during raids, and ritual use have all been proposed, with evidence pointing to different uses at different sites.

The Lissyline souterrain is a recorded monument, which places it within a long catalogue of such structures found across Clare and the wider Irish landscape. Clare itself has a dense concentration of early medieval settlement archaeology, reflecting centuries of farming communities who shaped the land in ways that occasionally surface, literally, when a field is ploughed or a ditch is cut. The townland name Lissyline likely contains the element "lios", the Irish word for a ringfort enclosure, hinting that this souterrain may once have sat within or beside exactly that kind of settlement. Beyond its existence as a catalogued site, the specific details of this particular passage, its dimensions, its current condition, and its precise relationship to any surrounding features, remain to be fully documented in the public record.