This motte,mutilated by stone robbers,in antiquity,was,like Newcastle(upon Clun) motte,probably built to guard/police a crossing point on the nearby River Clun.There is no evidence of a bailey and room on top of the motte for only a tower.It probably served as a refuge in times of strife,but more probably as a status symbol for some lowly lord,who would have lived nearby in a hall little better than the houses his serfs lived in.
see http://castlefacts.info/contentpages/castledetails/castledetails.asp?country=England&countyid=35&county=Shropshire&castleid=3248&latitude=52.4026&longitude=-2.8894&uin=13095