Abbotless monastery (6)
I believe the answer is:
priory
'abbotless monastery' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for priory that I've seen before include "Christian religious house subject to an abbey" , "Small monastery or nunnery" , "Religious community" , "Abbotless monastery" , "Religious house of monks or nuns" .)