Islands drive Elvis mad (8)
I believe the answer is:
maldives
'islands' is the definition.
(island nation)
'drive elvis mad' is the wordplay.
'elvis mad' can be anagrammed to 'MALDIVES'.
Though, I am not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for maldives that I've seen before include "Mad Elvis found in the islands" , "Indian Ocean island country" , "Indian Ocean country, capital Male" , "Mad Elvis might be in the islands" , "Indian Ocean country of many islands" .)