21 across
Where
religious
crowd
congregate
to
see
villain
beheaded
(4)
Where religious crowd congregate to see villain beheaded (4)
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0
hints
The definition is at the beginning of the clue.
How the clue works
Look at Where religious crowd congregate — that's the main body of a church. For the wordplay, take villain, which gives you KNAVE, then beheaded tells you to lop off the first letter, leaving you with NAVE.