What does the cryptic crossword clue "Spoil dumped on lake is clayey rock (4)" mean?

The definition is "clayey rock". The wordplay uses a charade (building blocks). MAR (synonym="Spoil") + L (abbreviation="lake") = MARL; definition: "clayey rock" The answer is MARL.

Spoil dumped on lake is clayey rock (4)

Times Cryptic #28784 | 25 Down | 2023-12-12 flower

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