What does the cryptic crossword clue "Volcano in Vietnam (4)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Volcano in Vietnam (4)

Guardian #3835 | 1 Across | 2020-04-12 flower

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Also seen in

Times Sunday #5016 (2022-07-17)