What does the cryptic crossword clue "One marsupial in love with another (7)" mean?

The wordplay uses a charade (building blocks). O (synonym="love") + POSSUM (synonym="love") = OPOSSUM The answer is OPOSSUM.

One marsupial in love with another (7)

Guardian Cryptic #29124 | 10 Across | 2023-07-17 flower