What does the cryptic crossword clue "Ancient writer understood Guardian readers (7)" mean?

The definition is "Ancient writer". The wordplay uses a charade (building blocks). TACIT (synonym="‘understood’") + US (synonym="‘Guardian readers’") = TACITUS; definition: "Ancient writer" The answer is TACITUS.

Ancient writer understood Guardian readers (7)

Guardian Cryptic #29056 | 17 Down | 2023-04-28 flower

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