Stop! Shut up! The clergyman is coming in! (7)
I believe the answer is:
prevent
'stop' is the definition.
(thesaurus)
'shut up the clergyman is coming in' is the wordplay.
'shut up' becomes 'pent' ('pent' can be a synonym of 'shut up').
'the clergyman' becomes 'rev' (I've seen this before).
'is coming in' is an insertion indicator.
'pent' going around 'rev' is 'PREVENT'.
(Other definitions for prevent that I've seen before include "Avert, hinder" , "Thwart" , "Stop (an action)" , "Bar" , "Keep from happening" .)