What does the cryptic crossword clue "Note total return for old city establishment figure (5)" mean?

The wordplay uses a reversal. RE (synonym="note, as in do re mi") + SUM (reversal="SUM") = REMUS The answer is REMUS.

Note total return for old city establishment figure (5)

Guardian Cryptic #29240 | 10 Across | 2023-11-29 flower