What does the cryptic crossword clue "Mostly screw, drinking sparkling wine: one could be at mine (9)" mean?

The definition is "one could be at mine". The wordplay uses a container (one word inside another). CAVA (synonym="CAVA") in EXTOR (synonym="EXTOR") = EXCAVATOR The answer is EXCAVATOR.

Mostly screw, drinking sparkling wine: one could be at mine (9)

Guardian Cryptic #29113 | 15 Across | 2023-07-04 flower

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