Refugees from Corsica and Réunion after sea-levels rise! (6)
I believe the answer is:
exiles
'refugees' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for exiles that I've seen before include "They live away from their homeland" , "They live away from their own country" , "They live outside their home countries" , "They are compelled to live abroad" , "Outlaws" .)