What does the cryptic crossword clue "Unity later developed as a Swiss hallmark (10)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Unity later developed as a Swiss hallmark (10)

Daily Mail Cryptic #16977 | 11 Across | 2022-11-28 flower

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