Mediterranean tree (5)
I believe the answer is:
olive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mediterranean tree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for olive that I've seen before include "Yellowy-green colour and fruit" , "Evergreen Mediterranean tree" , "Girl's name - colour" , "Greyish-green; fruit" , "It's branch is a symbol of peace" .)