Atlantic island (7)
(Other definitions for ascension that I've seen before include "religious feast" , "holy day" , "Canonises on Christ's way to heaven" , "Island in the South Atlantic" , "A movement upward" .)
(Other definitions for bermuda that I've seen before include "N. Atlantic island group" , "shorts originated here" , "Islands in the north-west Atlantic" , "NW Atlantic colony" , "Island group in NW Atlantic" .)