What does the cryptic crossword clue "Island in unsettled US area, or continental one? (7)" mean?

The definition is "continental one". The wordplay uses anagram, charade. anagram of USAREA ("US area,") [anagram: "unsettled"] + I (abbreviation of "Island") = EURASIA; definition: "continental one?" The answer is EURASIA.

Island in unsettled US area, or continental one? (7)

Times Cryptic #28088 | 17 Down | 2021-09-21 flower

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Telegraph #29685 (2021-05-26)