Tree from Mediterranean island, I hear (7)
I believe the answer is:
cypress
'tree' is the definition.
(cypress is a kind of tree)
'mediterranean island i hear' is the wordplay.
'mediterranean island' becomes 'cyprus' (I've seen this before).
'i hear' shows a homophone (sound like).
'cyprus' is a homophone of 'CYPRESS'.
'from' acts as a link.
(Other definitions for cypress that I've seen before include "Evergreen, mourning symbol" , "Conifer, symbol of mourning" , "Widely cultivated conifer" , "One living in churchyard" , "Coniferous tree" .)