Cleric lost one building (7)

I believe the answer is:

minster

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'one building' is the definition.
(minster is a kind of building)

I cannot understand how the rest of the clue works.

(Other definitions for minster that I've seen before include "Large important church" , "Abbey or priory church" , "Large church (or cathedral at York)" , "Clergyman" , "Old monastic cathedral, such as York's" .)

I've seen this clue in The Mirror.

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