23 down
This
erupts
frequently
in
Vietnam
(4)
This erupts frequently in Vietnam (4)
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The definition is at the beginning of the clue.
How the clue works
Look at this erupts — that's your definition, pointing you to the famous Sicilian volcano. The sneaky bit is that the answer is hiding inside "viETNAm", with "in" signalling that it's tucked away in there.