Island occupant I guarantee to protect (7)
I believe the answer is:
antigua
'island' is the definition.
(I've seen this before)
'occupant i guarantee to protect' is the wordplay.
'to protect' indicates a hidden word (the answer is protected by the clue).
'ANTIGUA' is hidden within 'occupant i guarantee'.
(Other definitions for antigua that I've seen before include "Caribbean island linked with Barbuda" , "holiday destination" , "warm island" , "Largest of Leeward Is." , "West Indies island" .)