What does the cryptic crossword clue "Old poems from the east, almost all augmented (4)" mean?

The definition is "Old poems". The wordplay uses a reversal. ADDE (reversal="ADDE") = EDDA; definition: "Old poems" The answer is EDDA.

Old poems from the east, almost all augmented (4)

Times Cryptic #29089 | 13 Across | 2024-12-02 flower