What does the cryptic crossword clue "Rare earth element found primarily in underwater ridge (4)" mean?

The definition is "ridge". The wordplay uses acrostic. R (first_letter="Rare") + E (abbreviation="earth") + E (first_letter="element") + F (first_letter="found") = REEF; definition: "underwater ridge" The answer is REEF.

Rare earth element found primarily in underwater ridge (4)

Guardian Cryptic #29090 | 21 Across | 2023-06-07 flower

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