What does the cryptic crossword clue "Spread discharge — it's all over now (4,5)" mean?

The wordplay uses a charade (building blocks). PASTE (synonym="spread") + VENT (synonym="discharge") = PASTEVENT The answer is PASTEVENT.

Spread discharge — it's all over now (4,5)

Guardian Cryptic #29173 | 18 Across | 2023-09-12 flower