What does the cryptic crossword clue "Regret impolite daughter being banished (3)" mean?

The definition is "Regret". The wordplay uses a deletion. RUE (deletion) = RUE; definition: "Regret" The answer is RUE.

Regret impolite daughter being banished (3)

Guardian Cryptic #29564 | 17 Across | 2024-12-12 flower