26 across
Giving
lip
in
church
is
a
sin
(5)
Giving lip in church is a sin (5)
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The definition is at the end of the clue.
How the clue works
Right, so a sin at the end is your definition, meaning a crime or wrongdoing. For the wordplay, take RIM as the word for lip, and pop it inside CE (that's your abbreviation for church), giving you C-RIM-E — CRIME.