Everybody goes round to the island (5)
I believe the answer is:
atoll
'the island' is the definition.
(I've seen this in another clue)
'everybody goes round to' is the wordplay.
'everybody' becomes 'all' (I've seen this in another clue).
'goes round' indicates putting letters inside.
'all' enclosing 'to' is 'ATOLL'.
(Other definitions for atoll that I've seen before include "Coral island surrounding a lagoon" , "Land around a lagoon, such as Bikini" , "Circular coral reef" , "tropical paradise?" , "String of islands" .)