What does the cryptic crossword clue "Frontier as worryingly endangered area (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.

Frontier as worryingly endangered area (10)

Telegraph Prize Cryptic #3206 | 5 Down | 2023-04-02 flower

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