What does the cryptic crossword clue "Bill's old trouble (3)" mean?

The definition is "trouble". The wordplay uses a charade (building blocks). AD (synonym of "Bill's") + O (synonym of "old"); definition: "trouble" The answer is ADO.

Bill's old trouble (3)

Guardian Cryptic #28945 | 17 Across | 2022-12-20 flower

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