What does the cryptic crossword clue "Work with a large stone (4)" mean?

The definition is "stone". The wordplay uses a charade (building blocks). OP (abbreviation="Work") + A (from clue) + L (abbreviation="large") = OPAL; definition: "stone" The answer is OPAL.

Work with a large stone (4)

Daily Mail Cryptic #16504 | 25 Across | 2021-02-03 flower

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