What does the cryptic crossword clue "President leaves a drop of red wine (5)" mean?

The definition is "wine". The wordplay uses a deletion. MACON (deletion) + (deletion) = MACON; definition: "wine" The answer is MACON.

President leaves a drop of red wine (5)

Guardian Cryptic #28944 | 19 Across | 2022-12-19 flower