What does the cryptic crossword clue "Regretting line omitted from decree (5)" mean?

The definition is "Regretting". The wordplay uses a deletion. RUING (deletion) = RUING; definition: "Regretting" The answer is RUING.

Regretting line omitted from decree (5)

Times Cryptic #28983 | 2 Down | 2024-07-31 flower