The Cloonchas is the area of Cloonbonnive and Gortaganny in West Roscommon where most townlands begin with 'Cloon', eg. Cloonfower, Clooncan. From the Irish for meadows, 'Cluainte'.
'A thing of' is a very Irish way of describing an inanimate object, usually a container or packaging of sorts. Be it down to laziness, or actually not knowing the name of what the object is, this expression has many uses.