24 down
Test
of
popular
opinion
to
the
north
(4)
Test of popular opinion to the north (4)
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hints
The definition is at the beginning of the clue.
How the clue works
Look at Test of — that's your definition, pointing at an oral examination. Hidden inside "popuLAR Opinion" you'll find the letters we need, but because this is a down clue, "to the north" tells you to read them backwards.