What does the cryptic crossword clue "Prepared ahead to deliver scam (5,2)" mean?

The wordplay uses a charade (building blocks). READY (synonym="”Prepared”") + UP (synonym="”ahead”") = READYUP The answer is READYUP.

Prepared ahead to deliver scam (5,2)

Guardian Cryptic #29376 | 12 Across | 2024-05-07 flower