Possible Clues:

• Flower, gold one, at Number Two briefly
• Great river in the north of S America, flows through Venezuela
• In South America, or in nothing that's firm
• Ocoro is such a big flower
• O, I croon about the river
• Colombia/Venezuela river
• Ocoro, perhaps, where the flow goes the right way
• A S. American river
• South American banker leaves gold with old firm
• Puerto Ayacucho's river