Cathedral (7)
I believe the answer is:
minster
'cathedral' is the definition.
(minster is a kind of cathedral)
This is the entire clue.
(Other definitions for minster that I've seen before include "Large church (eg, York)" , "Old monastic cathedral, such as York's" , "Large church (or cathedral at York)" , "Abbey or priory church" , "Large important church" .)