Cleric loses one of his church (7)
I believe the answer is:
minster
'church' is the definition.
(I know that minster is a type of cathedral)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for minster that I've seen before include "Large church (or cathedral at York)" , "Large important church" , "Large church (eg, York)" , "Old monastic cathedral, such as York's" , "Abbey or priory church" .)