9 across
Guide
taking
temperature
at
back
of
place
of
worship
(7)
Guide taking temperature at back of place of worship (7)
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The definition is at the beginning of the clue.
How the clue works
Look at Guide — that's your definition, since a templet is a pattern or guide. For the wordplay, take TEMPLE (place of worship) and stick T (the standard abbreviation for temperature) at the back of it.