Volcanic vestige (5)
I believe the answer is:
atoll
(Other definitions for atoll that I've seen before include "Bikini for one" , "tropical island" , "Bikini, say" , "Ring of coral" , "Circular coral reef" .)
I believe the answer is:
atoll
(Other definitions for atoll that I've seen before include "Bikini for one" , "tropical island" , "Bikini, say" , "Ring of coral" , "Circular coral reef" .)