What does the cryptic crossword clue "Stones number one track changes here (3,4)" mean?

The definition is "Stones number one". The wordplay uses a charade (building blocks). PITS (synonym of "Stones") + TOP (synonym of "number one"); definition: "track changes here" The answer is PITSTOP.

Stones number one track changes here (3,4)

Guardian Cryptic #28972 | 17 Across | 2023-01-20 flower

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