What does the cryptic crossword clue "Two thirds of models fall hopelessly for past lover (3,5)" mean?

The definition is "past lover". The wordplay uses an anagram. anagram of MODE FALL = OLDFLAME; definition: "past lover" The answer is OLDFLAME.

Two thirds of models fall hopelessly for past lover (3,5)

Guardian Cryptic #28962 | 15 Down | 2023-01-09 flower