Clústor-loc

According to the Old English Dictionary:

clúster-loc, es;

clústor-loc

pl. nom. -loca; n. A prison-lock, lock, bar; claustellum, claustrum :-- Clústor-loca [MS. -locæ] claustella, Glos. Epnl. Recd. 156, 2. Clúster-loc claustellum, Cot. 34: claustrum, 181. clustor-loc