What does the cryptic crossword clue "Fleming returned with Gallico and another author (7)" mean?

The wordplay uses a reversal. IAN (reversal="IAN") + PAUL (synonym="PAUL") = NAIPAUL The answer is NAIPAUL.

Fleming returned with Gallico and another author (7)

Guardian Cryptic #29254 | 21 Across | 2023-12-15 flower