What does the cryptic crossword clue "Surprise regarding 50% refund (7)" mean?

The definition is "S". The wordplay uses a charade (building blocks). AS (synonym="AS") + TO (synonym="regarding") + UND (synonym="UND") = ASTOUND; definition: "Surprise" The answer is ASTOUND.

Surprise regarding 50% refund (7)

Guardian Cryptic #29130 | 17 Across | 2023-07-24 flower

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