Tree from Mediterranean island, say (7)
I believe the answer is:
cypress
'tree' is the definition.
(cypress is a kind of tree)
'mediterranean island say' is the wordplay.
'mediterranean island' becomes 'cyprus' (I've seen this before).
'say' shows a homophone (sound like).
'cyprus' is a homophone of 'CYPRESS'.
'from' is the link.
(Other definitions for cypress that I've seen before include "symbol of death" , "Coniferous tree" , "Dark-leaved conifer" , "Widely cultivated conifer" , "Conifer, symbol of mourning" .)