What does the cryptic crossword clue "Make good your sins an hour after midday? (5)" mean?

The definition is "Make good your sins". The wordplay uses a charade (building blocks). A (abbreviation="an") + TONE (synonym="after") = ATONE; definition: "Make good your sins" The answer is ATONE.

Make good your sins an hour after midday? (5)

Telegraph #30563 | 21 Down | 2024-03-16 flower

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Times Cryptic #28050 (2021-08-07) Independent Cryptic #1644 (2021-08-29)