What does the cryptic crossword clue "Earthy expression used endlessly by Descartes? (7)" mean?

The definition is "Earthy". The wordplay uses a charade (building blocks). TER (synonym="TER") + RENE (synonym="Descartes") = TERRENE; definition: "Earthy" The answer is TERRENE.

Earthy expression used endlessly by Descartes? (7)

Times Cryptic #28706 | 28 Across | 2023-09-12 flower

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