What does the cryptic crossword clue "Acting to prevent illness, colonist provided essential pieces of alum (7)" 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.

Acting to prevent illness, colonist provided essential pieces of alum (7)

Times Cryptic #29326 | 9 Across | 2025-09-04 flower

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