What does the cryptic crossword clue "Rock at the lowest level beginning on top (6)" mean?

The definition is "Rock". The wordplay uses acrostic, charade. BASAL (synonym of "at the lowest level") + T (first letter of "top") [first letter: "beginning"]; definition: "Rock" The answer is BASALT.

Rock at the lowest level beginning on top (6)

Times Cryptic #29024 | 10 Across | 2024-09-17 flower

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