What does the cryptic crossword clue "Work with nurse for free (4)" mean?

The definition is "Work". The wordplay uses a charade (building blocks). OP (synonym of "Work") + EN (synonym of "nurse"); definition: "free" The answer is OPEN.

Work with nurse for free (4)

Guardian Cryptic #29785 | 15 Across | 2025-08-28 flower

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