An archaeological investigation was carried out on the south wall of the church at Clare Priory. Much of the south wall has the appearance of a 19th century rebuild and the aim of the investigation was to determine whether it has a medieval core. The results of a measured survey of the inner and outer elevations and a series of test holes suggested that whilst the footings and western end of the wall were medieval, most of the wall length had been reconstructed in two phases in the 18th and 19th centuries. A medieval footing, in the form of a solid pad of bonded flint 7m2, was also found, suggesting a structure had projected from the southern wall. This may have supported an outshot staircase which is illustrated on 18th century engravings of the building. Evidence of an earlier footing also suggested that there was a building predating the church on the site.