Hide in corner of Greek island (7)
I believe the answer is:
secrete
'hide' is the definition.
(I know that secrete is a type of hide)
'corner of greek island' is the wordplay.
'corner of' becomes 'SE' (the south eastern corner of something).
'greek island' becomes 'crete' (Crete is a Greek island).
'se'+'crete'='SECRETE'
'in' is the link.
(Other definitions for secrete that I've seen before include "squirrel" , "harbour" , "Hide or conceal an object" , "Place out of sight, hide" , "Hide away" .)