What does the cryptic crossword clue "50% of brides-to-be flipping innocent (4)" mean?

The definition is "innocent". The wordplay uses a reversal. FIAN (reversal="FIAN") = NAIF; definition: "innocent" The answer is NAIF.

50% of brides-to-be flipping innocent (4)

Independent Cryptic #11857 | 25 Across | 2024-10-10 flower