What does the cryptic crossword clue "Top island (6)" 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.

Top island (6)

Telegraph #28684 | 3 Down | 2018-03-12 flower

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Also seen in

Independent Cryptic #11933 (2025-01-07) Telegraph Prize Cryptic #3174 (2022-08-21)