What does the cryptic crossword clue "This precursor of flood proving ruinously expensive (8,3,4)" mean?

The definition is "proving ruinously expensive". The wordplay uses a charade (building blocks). BREAKING (synonym="BREAKING") + THE (synonym="THE") + BANK (synonym="BANK") = BREAKINGTHEBANK; definition: "proving ruinously expensive" The answer is BREAKINGTHEBANK.

This precursor of flood proving ruinously expensive (8,3,4)

Guardian Cryptic #28957 | 28 Across | 2023-01-03 flower

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