Mediterranean island tree, reportedly (6)
I believe the answer is:
cyprus
'mediterranean island' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for cyprus that I've seen before include "Island member of the European Union" , "Partitioned Med. island" , "Mediterranean island country" , "Limassol's island" , "Divided Med. island" .)