What does the cryptic crossword clue "Advertise book badly (4)" mean?

The definition is "Advertise". The wordplay uses a charade (building blocks). B (abbreviation="book") + ILL (synonym="badly") = BILL; definition: "Advertise" The answer is BILL.

Advertise book badly (4)

Daily Mail Cryptic #17099 | 14 Down | 2023-05-17 flower

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