Caribbean island that could be a danger (7)
I believe the answer is:
grenada
'caribbean island' is the definition.
(I know that Grenada is a island)
'could be a danger' is the wordplay.
'could be' is an anagram indicator.
'a'+'danger'='adanger'
'adanger' with letters rearranged gives 'GRENADA'.
'that' is the link.
(Other definitions for grenada that I've seen before include "Nation" , "commonwealth state" , "Island just north of Trinidad" , "W, Indies island" , "Caribbean island country" .)