What does the cryptic crossword clue "How South American promotes growth in Nicaraguan oil (5)" 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.

How South American promotes growth in Nicaraguan oil (5)

Guardian Cryptic #26608 | 26 Across | 2015-06-26 flower

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