What does the cryptic crossword clue "Billionaire invested in revolutionary American plant (7)" mean?

The wordplay uses a container (one word inside another). ELON (synonym="ELON") in CHE (synonym="CHE") = CHELONE The answer is CHELONE.

Billionaire invested in revolutionary American plant (7)

Guardian Cryptic #29390 | 22 Across | 2024-05-23 flower